List of top Physics Questions on Optics asked in Common University Entrance Test

An equilateral prism is made of material of refractive index \(\sqrt{3}\). The angle of minimum deviation through the prism is:

For a light pipe as shown in the figure:

(A) Optical density of core should be greater than the optical density of cladding.
(B) r and θ will always be equal.
(C) Optical density of cladding is \(\frac{sinθ sin i}{sin r}\).
(D) Optical density of cladding is \(\frac{sin r sin i }{sin θ}.\)
Choose the correct answer from the options given below:

Light from a point source in air falls on a spherical glass surface (n = 1.5, radius of curvature = 10cm). The distance of the light source from the glass surface is 50 cm. The position at which the image is formed is:

Read the following:
(A) The width of the central band in a diffraction pattern.
(B) The width of the first bright band in the diffraction pattern.
(C) The width of the central band in the diffraction pattern if D is doubled.
(D) The width of the first bright band in the diffraction pattern if D is tripled.
Choose the correct answer from the options given below in increasing order of width.

\(\text{ Arrange the following in increasing order of focal length of convex lens:}\)
\((A)\) \(F_v\), focal lengths of violet
 \((B)\) \(F_r\), focal lengths of red
 \((C)\) \(F_b\), focal lengths of blue
\((D)\) \(F_y\), focal lengths of yellow
\(\text{Choose the correct answer from the options given below:}\)

\(\text{ Light is incident on an interface between water } (\mu = \frac{4}{3}) \text{ and glass } (\mu = \frac{3}{2}).\\\) \(\text{For total internal reflection, light should be traveling from:}\)

Match List-I with List-II. The optical instruments are listed in List-I and their lens/mirror types in List-II.

Choose the correct matching of instruments and their uses from the options given below:

Lower half of a convex lens is made opaque. Which of the following describes the image of the object placed in front of the lens?(A) No change in image
(B) Image will show only half of the object
(C) Intensity of image gets reduced
Choose the correct answer from the options given below.

Two slits are made 0.1 mm apart and the screen is placed 2 m away. The fringe separation when a light of wavelength 500 nm is used is______.
Fill in the blank with the correct answer from the options given below.

For an astronomical telescope having objective lens of focal length 10 m and eyepiece lens of focal length 10 cm, telescope’s the tube length and magnification respectively are __________.
.Fill in the blank with the correct answer from the options given below.

The refractive index of the material of an equilateral prism is √2. The angle of minimum deviation of the prism is______.
Fill in the blank with the correct answer from the options given below.

In the figure given below, APB is a curved surface of radius of curvature 10 cm separating air and a transparent material \((μ = \frac{4}{3} ).\) A point object O is placed in air on the principal axis of the surface 20 cm from P. The distance of the image of O from P will be _____.
Fill in the blank with the correct answer from the options given below

For fixed values of radii of curvature of lens, power of the lens will be ____.
Fill in the blank with the correct answer from the options given below

The graph correctly representing the variation of image distance ’v’ for a convex lens of focal length ’f’ versus object distance ’u’ is ______.
Fill in the blank with the correct answer from the options given below

Using light from a monochromatic source to study diffraction in a single slit of width 0.1 mm, the linear width of central maxima is measured to be 5 mm on a screen held 50 cm away. The wavelength of light used is _______.
Fill in the blank with the correct answer from the options given below