Ray Optics Additional Practice Test

12th Standard Physics — Ray Optics: Additional Online Practice Test

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In a plane mirror reflection, if the incident ray makes an angle of \(30^{\circ}\) with the mirror surface, what is the angle of deviation produced?

A.\(30^{\circ}\) B.\(60^{\circ}\) C.\(120^{\circ}\) D.\(150^{\circ}\)

A convex mirror used in a vehicle has a radius of curvature of 40 cm. What is the focal length of this mirror according to the Cartesian sign convention?

A.-20 cm B.+20 cm C.-40 cm D.+40 cm

An object is placed at a distance of 20 cm from a concave mirror with a focal length of 10 cm. What is the lateral magnification produced by the mirror?

A.-1 B.+1 C.-2 D.+2

If the speed of light in a certain transparent oil is \(2.4 \times 10^8\) m s\(^{-1}\), what is the refractive index of the oil? (Assume speed of light in vacuum is \(3 \times 10^8\) m s\(^{-1}\))

A.0.8 B.1.2 C.1.25 D.1.5

A glass plate has a thickness of 5 cm and a refractive index of 1.6. What is the optical path of light passing through this glass plate?

A.3.125 cm B.5.0 cm C.8.0 cm D.10.0 cm

A ray of light is incident at \(60^{\circ}\) on the surface of a liquid with a refractive index of \(\sqrt{3}\). What is the angle of refraction?

A.\(30^{\circ}\) B.\(45^{\circ}\) C.\(60^{\circ}\) D.\(90^{\circ}\)

At sunrise or sunset, the sun is visible before it actually crosses the horizon. Which phenomenon is responsible for this?

A.Total internal reflection B.Atmospheric refraction C.Rayleigh scattering D.Diffraction

Under what condition will light travelling from one medium to another undergo total internal reflection?

A.Rarer to denser medium, incidence angle less than critical B.Denser to rarer medium, incidence angle less than critical C.Denser to rarer medium, incidence angle greater than critical D.Rarer to denser medium, incidence angle greater than critical

In an optical fibre, if the refractive index of the core is \(n_1\) and the refractive index of the cladding is \(n_2\), the numerical aperture in air is given by:

A.\(n_1^2 - n_2^2\) B.\(\sqrt{n_1^2 - n_2^2}\) C.\(\frac{n_1}{n_2}\) D.\(\sqrt{n_1^2 + n_2^2}\)

Q10

A point object in air (\(n_1=1\)) is placed 30 cm from a convex spherical refracting surface made of plastic (\(n_2=2\)) with a radius of curvature of 15 cm. Where is the final image formed?

A.30 cm from the surface B.45 cm from the surface C.60 cm from the surface D.90 cm from the surface

Q11

A biconvex lens is manufactured from glass of refractive index 1.5. If the radii of curvature of the two surfaces are 20 cm and 30 cm, what is the focal length of the lens?

A.12 cm B.24 cm C.40 cm D.60 cm

Q12

Two thin lenses of focal lengths +20 cm and -25 cm are placed in contact. What is the power of this combination in dioptres?

A.-1 D B.+1 D C.-9 D D.+9 D

Q13

When a prism is in the position of minimum deviation, which of the following is true for the refracted ray inside the prism?

A.It is parallel to the base for an equilateral prism B.It travels along the normal C.It is perpendicular to the base D.It undergoes total internal reflection

Q14

A prism material has refractive indices of 1.66 and 1.62 for violet and red light respectively. If the mean refractive index is 1.64, calculate its dispersive power.

A.0.025 B.0.040 C.0.0625 D.0.080

Q15

Which property of light is responsible for the blue appearance of the sky?

A.Longer wavelengths are scattered more B.Scattering intensity is independent of wavelength C.Shorter wavelengths are scattered more D.Only blue light is reflected by air molecules

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About this Ray Optics test

This free online practice test covers Ray Optics from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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