Ray Optics - Optics - Physics Previous Year Questions

When an object is placed \(40 \mathrm{~cm}\) from a diverging lens, its virtual image is formed \(20 \mathrm{~cm}\) from the lens. The focal length and power of lens are

An object is \(8 \mathrm{~cm}\) high. It is desired to form a real image \(4 \mathrm{~cm}\) high at \(60 \mathrm{~cm}\) from the mirror. The type of mirror needed with the focal length is

A person has a minimum distance of distinct vision as \(50 \mathrm{~cm}\). The power of lenses required to read a book at a distance of \(25 \mathrm{~cm}\) is

If an object of height \(6 \mathrm{~cm}\) is viewed through a liquid of refractive index \(\frac{4}{3}\) vertically at a depth of \(10 \mathrm{~cm}\). Then what will be its apparent height and apparent distance from the surface of liquid.

A plane glass mirror of thickness \(3 \mathrm{~cm}\) of material of \(\mu=\frac{3}{2}\) is silvered on the back surface. When a point object is placed \(9 \mathrm{~cm}\) from the front surface of the mirror, then the position of the brightest image from the front surface is

The focal length of thin convex lens for red and blue rays are \(100 \mathrm{~cm}\) and \(98.01 \mathrm{~cm}\), respectively. There, the dispersive power of the material of the lens is

A light ray of wavelength 546 nm is incident on an air-glass interface. If the speed of light in air is $3 \times 10^8 \mathrm{~m} / \mathrm{s}$. Then, wavelength of light ray in glass will be

[Take, refractive index of glass, $\mu=1.5$ ]