When a light ray from a rarer medium is ...

When a light ray from a rarer medium is refracted into a denser medium, its

Speed increases, wavelength increases

Speed decreases, wavelength increases

Speed increases, wavelength decreases

Speed decreases, wavelength decreases

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When light is refracted into a medium

When a ray of light travels obliquely from a rarer medium to a denser medium, it bends away from the normal.

A : When a light wave travels from a rarer to a denser medium, it looses speed. The reduction in speed imply a reduction in energy carried by the light wave. R : The energy of a wave of proportional to frequency of wave.

Assertion: When a light wave travels from a rarer to a denser medium, it loses speed. The reduction in speed imply a reduction in energy carried by the light wave. Reason: The energy of a wave is proportional to velocity of wave.

A ray of light is moving from a rarer medium to a denser medium and strikes a plane mirror placed at 90^(@) to the direction of the ray as shown in the diagram. Name the principle you have used to mark the arrows to show the direction of the ray.

Fill in the blanks to complete the following sentence: Q: When light travels from a rarer to a denser medium, its speed _____

(a) State Huygen's principle . Using this principle draw a diagram to show how a plane wave front incident at the interface of the media gets refracted when it propagates from a rarer to a denser medium. Hence verify Snell's law of refraction. (b) When monochromatic light travels from a rarer to a denser medium, explain the following, giving reasons- (i) Is the frequency of reflected and refracted light same as the frequency of incident light? (ii) Does the decrease in speed imply a reduction in the energy carried by light wave?

Assertion: White light is incident on face AB of an isosceles right angled prism as shown. Colours, for which refractive index of material of prism is more than 1.414, will be able to emerge from the face AC. Reason:Total internal reflection cannot take place for the light travelling from a rarer medium to a denser medium.

A: When light travels from a rarer to a denser medium, it loses some speed but it doesn't imply a reduction in the energy carried by the light wave. R: Energy carried by a wave depends on the amplitude of the wave and not on the speed of wave propagation.

AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - A)

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