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Assertion :If there had been one eye of the man then image would have not been seen three-dimensional and visible region would have decreased

Reason : By two eyes, we get two images of an object simultaneously from two different angles. Their superposition gives us the complete information about length, width and depth of the object.

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Important Questions on Ray Optics

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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-2>Q 43
Calculate the phase velocity of electromagnetic wave having electron density and frequency for D layer, N=400 electron/cc, v=300 kHz
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-2>Q 44
A step index fibre has a relative refractive index of 0.88% What is the critical angle at the corecladding interface sin84°24'=0.9912
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Alpha Question Bank for Medical: Physics>Chapter 30 - Ray Optics>Exercise-2>Q 45

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.

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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.

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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?
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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:

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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?
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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: