A concave mirror is half dipped in water. Focal length of portion of mirror is the air is $f_{1}$ and focal length of mirror in water is $f_{2}$ , then (Take refractive index of water $= \frac{4}{3}$ )

Question

A concave mirror is half dipped in water. Focal length of portion of mirror is the air is

f_{1}

and focal length of mirror in water is

f_{2}

, then (Take refractive index of water

= \frac{4}{3}

)

Toppr Admin · Accepted Answer

The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the lows of reflection- So the focal length f- remains same in every medium-

Object Pin	Convex Lens	Convex Mirror	Image Pin
22.2 cm	32.2 cm	45.8 cm	71.2 cm

A concave mirror is half dipped in water. Focal length of portion of mirror is the air is $f_{1}$ and focal length of mirror in water is $f_{2}$ , then (Take refractive index of water $= \frac{4}{3}$ )
$f_{1} < f_{2}$
$f_{1} > f_{2}$
$f_{1} \geq \frac{4}{3} f_{2}$
$f_{1} = f_{2}$

The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the lows of reflection. So the focal length $f$ , remains same in every medium.

A concave mirror is half dipped in water. Focal length of portion of mirror is the air is f1 and focal length of mirror in water is f2, then (Take refractive index of water =43)f1<f2f1>f2f1≥43f2f1=f2

The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the lows of reflection. So the focal length f, remains same in every medium.

A concave mirror is half dipped in water. Focal length of portion of mirror is the air is $f_{1}$ and focal length of mirror in water is $f_{2}$ , then (Take refractive index of water $= \frac{4}{3}$ )
$f_{1} < f_{2}$
$f_{1} > f_{2}$
$f_{1} \geq \frac{4}{3} f_{2}$
$f_{1} = f_{2}$

The focal length of a mirror is function of its radius of curvature and is independent of the medium as it is based on the lows of reflection. So the focal length $f$ , remains same in every medium.