EASY
NEET
IMPORTANT
Earn 100

Assertion: When a light wave travels form a rarer to a denser medium, it loses speed. The speed reduction implies a reduction in energy carried by the light wave.

Reason: The energy of a wave is proportional to the velocity of the wave.

50% studentsanswered this correctly

Important Questions on Ray Optics

EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-2>Q 46

Assertion : A narrow pulse of light is sent through a medium. The pulse will retain its shape as it travels through the medium.

Reason : A narrow pulse is made of harmonic waves with a large range of wavelength.

EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 1
A boy is trying to start a fire by focusing sunlight on a piece of paper using an equi-convex lens of focal length 10 cm. The diameter of the sun is 1.39×109 m and its mean distance from the earth is 1.5×1011 m What is the diameter of the sun's image on the paper?
EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 2

Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is:

EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 3
A ray of light travelling in a transparent medium of refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45°. For which of the following value of μ the ray can undergo total internal reflection?
EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 4
A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter d2 in the central region of the lens is covered by black paper. The focal length of the lens and intensity of the image now will be respectively:
EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 5
The speed of light in media M1 and M2 are 1.5×108 m s-1 and 2.0×108 m s-1 respectively. A ray of light enters from medium M1 to M2 at an incidence angle i. If the ray suffers total internal reflection, the value of i is:
EASY
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 6
A ray of light is incident on a  60° prism at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is
MEDIUM
NEET
IMPORTANT
Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-3>Q 7
Which of these is not due to total internal reflection?