Physics

Light - Reflection and Refraction

390+ practice questions available

Sample Practice Questions

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Hard

Assertion (A): The focal length of a spherical mirror changes when it is immersed in water. Reason (R): The focal length of a spherical mirror is half its radius of curvature.

ABoth A and R are true and R is the correct explanation of A

BBoth A and R are true but R is not the correct explanation of A

CA is true but R is false

DA is false but R is true

Medium

The refractive index of glass is 1.5. If the speed of light in glass is v, the speed of light in a medium of refractive index 1.25 is:

A1.2v

B0.83v

C1.5v

Dv/1.25

Medium

An object is placed between F and C of a concave mirror. The image formed is:

ABetween F and C, real, diminished

BBeyond C, real, magnified

CBehind mirror, virtual, magnified

DAt F, real, same size

Easy

The SI unit of power of a lens is ________.

AMeter

BWatt

CDioptre

DCandela

Medium

Mirror 'X' is used to concentrate sunlight in solar furnace and Mirror 'Y' is fitted on the side of the vehicle to see the traffic behind the driver. Which of the following statements are true for the two mirrors? (i) The image formed by mirror 'X' is real, diminished and at its focus. (ii) The image formed by mirror 'Y' is virtual, diminished and erect. (iii) The image formed by mirror 'X' is virtual, diminished and erect. (iv) The image formed by mirror 'Y' is real, diminished and at its focus.

A(i) and (ii)

B(ii) and (iii)

C(iii) and (iv)

D(i) and (iv)

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