Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion (A): A hypermetropic person prefers to remove his spectacles, while driving.
Reason (R): When a hypermetropic person wearing the spectacles looks at a distant object, the parallel rays from the distant object get converged in front of the retina. The image thus appears blurred.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion (A): Light from a distant object arriving at the eye lens may get converged at a point in front of the retina.
Reason (R): The eye is producing too much divergence in the incident beam.
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Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion (A): Sunlight reaches us without dispersion in the form of white light and not as its components.
Reason (R): Dispersion takes place due to variation of refractive index for different wavelengths but in vacuum the speed of light is independent of wavelength and hence vacuum is a non-dispersive medium.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : Blue colour of sky appears due to scattering of blue colour.
Reason : Blue colour has the shortest wavelength in the visible spectrum.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : Light from a distant object arriving at the eye lens may get converged at a point in front of the retina.
Reason : The eye is producing too much divergence in the incident beam.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : The light of violet colour deviates the most and the light of red colour the least, while passing through a prism.
Reason : For a prism material, the refractive index is highest for red light and lowest for the violet light.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : Secondary rainbow is fainter than primary rainbow.
Reason : Secondary rainbow formation is a three step process and hence, the intensity of light is reduced at the second reflection inside the raindrop.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : There exists two angles of incidence for the same magnitude of deviation (except minimum deviation) by a prism kept in air.
Reason : In a prism kept in air, a ray is incident on the first surface and emerges out of the second surface. Now if another ray is incident on the second surface (of prism) along the previous emergent ray, then this ray emerges from the first surface along the previous incident ray. This particle is called the principle of reversibility of light.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : A rainbow is sometimes seen in the sky in rainy season only when observer’s back is towards the sun.
Reason : Internal reflection in the water droplets cause dispersion and the final rays are in backward direction.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : When we see an object, the image formed On the retina is real and inverted.
Reason : If the magnification of a system is less than one, then the image formed is inverted.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : The twinkling of stars is due to the fact that refractive index of the earth’s atmosphere fluctuates.
Reason : In cold countries, the phenomenon of looming (i.e., ship appears in the sky) takes place, because refractive index of air decreases with height.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason : Objective lens of large diameter coileds more light.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : Danger signals are made of red colour.
Reason : Velocity of red light in air is maximum, so signals are visible even in dark.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : In case of rainbow, light at the inner surface of the water drop gets internally reflected.
Reason : The angle between the refracted ray and normal to the drop surface is greater than the critircal angle.
Direction: In the Following Questions, A Statement of Assertion (A) Is Followed by A Statement of Reason (R). Mark The Correct Choice As:
Assertion : A white light on passing through a prism splits into its component colours as such that the red light emerges nearest to the base of the prism.
Reason : Wavelength of red light is more than other component colours and hence, red light deviates least.
23 videos|67 docs|58 tests
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23 videos|67 docs|58 tests
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