Ray Optics Book Back Practice Test

12th Standard Physics — Ray Optics: Book Back Online Practice Test

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The speed of light in an isotropic medium depends on,

A.its intensity B.its wavelength C.the nature of propagation D.the motion of the source w.r.t medium

A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is, (AIPMT Main 2012)

A.2.5 cm B.5 cm C.10 cm D.15 cm

An object is placed in front of a convex mirror of focal length of f and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified. (JEE Main 2009)

A.2f and c B.c and \(\infty\) C.f and O D.None of these

For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is,

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

If the velocity and wavelength of light in air is \(V_a\) and \(\lambda_a\) and that in water is \(V_w\) and \(\lambda_w\), then the refractive index of water is,

A.\(V_w/V_a\) B.\(V_a/V_w\) C.\(\lambda_w/\lambda_a\) D.\((V_a \lambda_a)/(V_w \lambda_w)\)

Stars twinkle due to,

A.reflection B.total internal reflection C.refraction D.polarisation

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index,

A.less than one B.less than that of glass C.greater than that of glass D.equal to that of glass

The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be,

A.5 cm B.10 cm C.15 cm D.20 cm

An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is,

A.8 cm B.10 cm C.12 cm D.16 cm

Q10

A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidence of \(45^\circ\). The ray can undergo total internal reflection for the following n,

A.n = 1.25 B.n = 1.33 C.n = 1.4 D.n = 1.5

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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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