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 $60^\circ$)

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?

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

A thin rod of length $\frac{f}{3}$ is placed along the optic axis of a concave mirror of focal length $f$, such that its image which is real and elongated just touches the rod, the magnification is

A point object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm , if the plane surface is silvered. The image will form at

Figure shows an irregular block of material of refractive index $\sqrt{2}$. A ray of light strikes the face $A B$ as shown in figure. After refraction, it is incident on a spherical surface $C D$ of radius of curvature…

Graph of position of image versus position of point object from a convex lens is shown. Then, focal length of the lens is