Q: A Concave mirror produces three times magnified real image of an object placed at \$10cm\$ infront of it . Where is the image located?

Given magnification \$m=3\$and object distance \$u=10\$ cm and we know,Magnification \$m=\dfrac{-v}{u}\$\$-v=3\times -10\$\$v=30\$ cmThus the image is formed at distance of 30 cm.

Q: A ray of light is incident on a plane mirror at an angle of incidence of \$30^o\$. The deviation produced by the mirror is:

Since angle of incident =angle of reflectionHence \$r=30^{0}\$And here angle of deviation,\$\delta=180^{0}-(i+r)\$\$\delta=120^{0}\$

Q: A plane mirror is approaching you at \$10 cm/s.\$ You can see your image in it. The image will approach you with a speed of :

In a plane mirror if the mirror moves at speed of \$v\$, then the image moves at a speed of \$2v\$.So, in this case, as mirror is moving at a speed \$10\ cm/s\$, the image will move at a speed of \$(2)\times (10)cm/s\$ \$=20cm/s\$

Q: Two plane mirrors are inclined at \${70}^{o}\$. A ray incident on one mirror at angle \$\theta\$, after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of \$\theta\$ :

In the triangle formed in figure-\$70°+70°+90°-\theta =180°\$\$\theta =50°\$

Q: A man runs towards a stationary mirror at a speed of \$15m/s\$. What is the speed of his image with respect to the mirror?

As \$\left| u \right| =\left| v \right| \\ \therefore \left| \cfrac { du }{ dt } \right| \left| \cfrac { dv }{ dt } \right| \$Speed of man=Speed of the imageAs mirror is stationary and hence speed of image w.r.t mirror will be \$15m/sec\$.It is only when asked with respect to the man, speed of image can be written as\$=15m/sec-\left( -15m/sec \right) =30m/sec\$

Question 1

A Concave mirror produces three times magnified real image of an object placed at $10cm$ infront of it . Where is the image located?

Accepted Answer

Given magnification $m=3$and object distance $u=10$ cm and we know,Magnification $m=\dfrac{-v}{u}$$-v=3\times -10$$v=30$ cmThus the image is formed at distance of 30 cm.

Question 2

A ray of light is incident on a plane mirror at an angle of incidence of $30^o$. The deviation produced by the mirror is:

Accepted Answer

Since angle of incident =angle of reflectionHence $r=30^{0}$And here angle of deviation,$\delta=180^{0}-(i+r)$$\delta=120^{0}$

Question 3

The minimum length of a plane mirror required to view the full image of a person 6 feet tall is :

Accepted Answer

It does not matter how far you are from the mirror. In order to see full image of a person, the minimum size of the mirror should be one half the person's height. This is so because, in reflection, the angle of incidence is equal to angle of reflection. So, to see the image of a 6 ft tall person, a 3 ft long mirror is required.

Question 4

A ray of light is incident on a plane mirror at an angle of $ 30^0 $ . what is the angle of reflection?

Accepted Answer

The incident ray will have an angle of reflection of 30 degrees (made with a surface normal to the mirror surface). The reflected ray will make an angle of 60 degrees (90 - 30 degrees) with the mirror surface

Question 5

A plane mirror is approaching you at $10 cm/s.$ You can see your image in it. The image will approach you with a speed of :

Accepted Answer

In a plane mirror if the mirror moves at speed of $v$, then the image moves at a speed of $2v$.So, in this case, as mirror is moving at a speed $10\ cm/s$, the image will move at a speed of $(2)\times (10)cm/s$ $=20cm/s$

Question 6

Two plane mirrors are inclined at ${70}^{o}$. A ray incident on one mirror at angle $\theta$, after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $\theta$ :

Accepted Answer

In the triangle formed in figure-$70&#176;+70&#176;+90&#176;-\theta =180&#176;$$\theta =50&#176;$

Question 7

If an object is placed at a distance of $0.5\,m$ in front of a plane mirror, the distance between the object and the image formed by the mirror will be

Accepted Answer

The image formed by the mirror is at same distance behind the mirror as object is in front of it, nowIf distance of object from mirror = 0.5 mThen distance of image from mirror = 0.5 mSo, distance between object and mirror = 0.5 m+ 0.5m = 1m

Question 8

A man runs towards a stationary mirror at a speed of $15m/s$. What is the speed of his image with respect to the mirror?

Accepted Answer

As $\left| u \right| =\left| v \right| \ \therefore \left| \cfrac { du }{ dt }  \right| \left| \cfrac { dv }{ dt }  \right| $Speed of man=Speed of the imageAs mirror is stationary and hence speed of image w.r.t mirror will be $15m/sec$.It is only when asked with respect to the man, speed of image can be written as$=15m/sec-\left( -15m/sec \right) =30m/sec$

Question 9

Draw a ray diagram for concave mirror when object is placed between focus and centre of curvature. Also write position, nature and size of image.

Accepted Answer

A real, inverted image is formed beyond the centre of curvature (C). It is larger than the object (enlarged image).

Question 10

State the characteristics of the image formed by a plane mirror.

Accepted Answer

(i) Plane mirror forms an erect image.(ii) It forms a virtual image.(iii) Size of the image is same as that of the object.(iv) Image is formed at the same distance behind the mirror as the object stands in front of it.(v)Image formed is a laterally inverted image i.e., right hand side of the object seems to be the left hand side and vice-versa.

Images Formed by Two Inclined Plane Mirrors

Language

Rate

REVISE WITH CONCEPTS

Advanced Knowledge of Reflection of Light Through Plane Mirror

Formation of Multiple Images With Plane Mirrors

QUICK SUMMARY WITH STORIES

Image formed by a Plane Mirror in Different Arrangements

Reflection of Light Through Plane Mirror - Advanced

Image Formation With Multiple Reflections

A Concave mirror produces three times magnified real image of an object placed at $10 c m$ infront of it . Where is the image located?

A ray of light is incident on a plane mirror at an angle of incidence of $3 0^{o}$ . The deviation produced by the mirror is:

The minimum length of a plane mirror required to view the full image of a person 6 feet tall is :

A ray of light is incident on a plane mirror at an angle of $3 0^{0}$ . what is the angle of reflection?

A plane mirror is approaching you at $10 c m / s .$ You can see your image in it. The image will approach you with a speed of :

Two plane mirrors are inclined at $70^{o}$ . A ray incident on one mirror at angle $θ$ , after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $θ$ :

If an object is placed at a distance of $0.5 m$ in front of a plane mirror, the distance between the object and the image formed by the mirror will be

A man runs towards a stationary mirror at a speed of $15 m / s$ . What is the speed of his image with respect to the mirror?

Draw a ray diagram for concave mirror when object is placed between focus and centre of curvature. Also write position, nature and size of image.

State the characteristics of the image formed by a plane mirror.

Images Formed by Two Inclined Plane Mirrors

Language

Rate

REVISE WITH CONCEPTS

Advanced Knowledge of Reflection of Light Through Plane Mirror

Formation of Multiple Images With Plane Mirrors

QUICK SUMMARY WITH STORIES

Image formed by a Plane Mirror in Different Arrangements

Reflection of Light Through Plane Mirror - Advanced

Image Formation With Multiple Reflections

A Concave mirror produces three times magnified real image of an object placed at 10cm infront of it . Where is the image located?

A ray of light is incident on a plane mirror at an angle of incidence of 30o. The deviation produced by the mirror is:

The minimum length of a plane mirror required to view the full image of a person 6 feet tall is :

A ray of light is incident on a plane mirror at an angle of 300 . what is the angle of reflection?

A plane mirror is approaching you at 10cm/s. You can see your image in it. The image will approach you with a speed of :

Two plane mirrors are inclined at 70o. A ray incident on one mirror at angle θ, after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of θ :

If an object is placed at a distance of 0.5m in front of a plane mirror, the distance between the object and the image formed by the mirror will be

A man runs towards a stationary mirror at a speed of 15m/s. What is the speed of his image with respect to the mirror?

Draw a ray diagram for concave mirror when object is placed between focus and centre of curvature. Also write position, nature and size of image.

State the characteristics of the image formed by a plane mirror.

A Concave mirror produces three times magnified real image of an object placed at $10 c m$ infront of it . Where is the image located?

A ray of light is incident on a plane mirror at an angle of incidence of $3 0^{o}$ . The deviation produced by the mirror is:

A ray of light is incident on a plane mirror at an angle of $3 0^{0}$ . what is the angle of reflection?

A plane mirror is approaching you at $10 c m / s .$ You can see your image in it. The image will approach you with a speed of :

Two plane mirrors are inclined at $70^{o}$ . A ray incident on one mirror at angle $θ$ , after reflection falls on second mirror and is reflected from there parallel to first mirror. The value of $θ$ :

If an object is placed at a distance of $0.5 m$ in front of a plane mirror, the distance between the object and the image formed by the mirror will be

A man runs towards a stationary mirror at a speed of $15 m / s$ . What is the speed of his image with respect to the mirror?