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Assertion: An air bubble in a jar of water shines brightly due to the phenomenon of total internal reflection.

Reason: Refraction of light is the phenomenon of change in the path of light when it goes from one medium to another.

32.08% studentsanswered this correctly

Important Questions on Ray Optics

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Assertion : For observing traffic at our back, we prefer to use a convex mirror.

Reason : A convex mirror has a much larger field of view than a plane mirror or concave mirror.

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Assertion: Critical angle of light passing from glass to air is minimum for violet colour.

Reason: The wavelength of violet light is greater than the light of other colours.

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Assertion: A concave mirror of some focal length in air is used in a medium of refractive index 2. Then the focal length of the mirror in that medium will remain the same.

Reason: The focal length of a mirror is half of the radius of curvature of the mirror.

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Assertion: We cannot produce a real image by plane or convex mirrors under any circumstances.

Reason: The focal length of a convex mirror is always taken as positive.

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Assertion: A ray incident along normal to the mirror retraces its path.

Reason: In reflection, angle of incidence is always equal to angle of reflection.
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Assertion: The frequencies of incident, reflected and refracted beam of monochromatic light incident from one medium to another are same.

Reason: The incident, reflected and refracted rays are coplanar.

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Assertion: A convex lens of glass (μ2=1.5) behave as a diverging lens when immersed in carbon disulphide of higher refractive index (μ1=1.65).

Reason: A convex lens is thinner in the middle and thicker at the edges.

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Assertion: The twinkling of stars is due to the refraction of light.

Reason: The velocity of light changes while going from one medium to the other.