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Ray Optics and Optical Instruments
Types Of Questions
4 min read
Ray Optics And Optical Instruments
- Wondering what kind of questions that can be asked in next exam? Here you go!
1
Very Short Answer Type Questions 1 mark
The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively. The refractive index of water with respect to glass is :
A
$8/9$
B
$9/8$
C
$1/2$
D
$2$
View solution
A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45
$_{∘}$
. The ray undergoes total internal reflection. The possible value of refractive index of the medium with respect to air is
A
1.245
B
1.324
C
1.414
D
1.524
View solution
If
$I$
is the intensity of scattered light of wavelength
$λ$
. then relation between them is given by:
A
$I∝λ_{4}1 $
B
$I∝λ_{4}$
C
$I_{2}∝λ_{4}1 $
D
$I∝λ1 $
View solution
2
Short Answer Type Questions -I 2 marks
Draw a ray diagram to show the image formation by a combination of two thin convex lenses to contact. Obtain the expression for the power of this combination in terms of the focal lengths of the lenses.
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A convex lens have focal length of 20 cm. the material of lens has refractive index of
$1.5$
is immersed in water of refractive index 4/3. find the change in focal length of the lens.
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How does the resolving power of a compound microscope get affected on
(i) Decreasing the diameter of its objective?
(ii) Increasing the focal length of its objective?
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3
Short Answer Type Questions - II 3 marks
The angle of incidence of the ray (2) on the face AB is
A
$0_{0}$
B
$45_{0}$
C
$30_{0}$
D
$90_{0}$
View solution
Figure shows a parallel beam of monochromatic light incident on a convex spherical surface, radius of curvature
$R=30$
cm, which separates glass(refractive index
$=1.6$
) from air. Find the position of the image formed due to refraction of light at this single spherical surface.
View solution
Lenses are constructed by a material of refractive index
$1.50$
. The magnitude of the radii of curvature are
$20cm$
and
$30cm$
. Find the focal lengths of the possible lenses with the above specifications.
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4
Long Answer Questions 5 marks
What is the difference in the construction of an astronomical telescope and a compound microscope ? The focal lengths of the objective and eyepiece of a compound microscope are 1.25 cm and 5.0 cm, respectively. Find the position of the object relative to the objective in order to obtain an angular magnification of 30 when the final image is formed at the near point.
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Describe the construction of a compound microscope. Derive an expression for its total magnification. Draw a ray diagram for the formation of image by a compound microscope.
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An object is placed
$15cm$
in front of a convex lens of focal length
$10cm$
. Find the nature and position of the image formed. Where should a concave mirror of radius of curvature
$20$
cm be placed so that the final image is formed at the position of the
object itself?
View solution