Ray Optics

A container is filled with water ($\mu = 4/3$) up to a height of 24 cm. A concave mirror is placed 10 cm above the water level, and the image (I) of an object placed at the bottom is formed 20 cm below the water level,…

Light enters from air into water of refractive index $\dfrac{4}{3}$. The percentage change in its wavelength is

A convex lens of refractive index $\mu$ has two surfaces of equal radius of curvature $R$. The focal length of convex lens is

The focal length of the objective of astronomical telescope is $2\ \text{m}$. Under normal adjustment, length of telescope is $2.10\ \text{m}$. The magnifying power of the telescope under normal adjustment is

Three beams of blue, green and orange colour are made to pass separately through a prism . In the position of minimum deviation, the angle of refraction will be (the angle of prism is $60^\circ$)

An object is placed 15 cm from a concave mirror of focal length 10 cm, then the nature of the image formed will be

The refracting angle of a prism is $'A'$ and its refractive index is $\cot\left(\dfrac{A}{2}\right)$. The minimum deviation produced by the prism is

What is the total optical path length of two media in contact with thicknesses of $d$ and $\dfrac{d}{4}$ and refractive indices of $n_1$ and $n_2$, respectively?

Which set of colours will come out in air for a situation shown in figure?

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?

A point object is placed at a distance of $60\mathrm{cm}$ from a convex lens of focal length $30\mathrm{cm}$. If a plane mirror were put perpendicular to the principal axis of the lens and at a distance of…

In the figure shown here, what is the equivalent focal length of the combination of lenses (Assume that all layers are thin)?