Previous Years Questions

The distance between the extreme points on the periphery of the mirror is called:

The amount of light reflected depends upon:

Double convex lenses are to be manufactured from a glass of refractive index $1.55$, with both faces having the same radius of curvature. What is the radius of curvature required if the focal length of the lens is to be $20 \mathrm{cm}$ ?

A ray of light is incident on a plane mirror and the angle of reflection is $50°$. Calculate the angle between the incident ray and the reflected ray.

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is $\raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.$. Their equivalent focal length is $30 \mathrm{cm}$. What are their individual focal length (in cm):

The resultant focal length of the lenses as shown in the figure is:

A ray of light is incident in medium $1$ on a surface that separate medium $1$ from medium $2$. Let $v_1$ and $v_2$ represent the velocity of light in medium $1$ and medium $2$ respectively. Also let $n_{12}$ and $n_{21}$ represent the refractive index of medium $1$ with respect to medium $2$ and refractive index of medium $2$ with respect to medium $1$, respectively. If $i$ and $r$ denote the angle of incidence and angle of refraction, then:

A convex lens has a focal length of $0.5 \mathrm{m}$. It has to be combined with a second lens, so that the combination has a power of $1.5 \mathrm{D}$. Which of the following could be the second lens?