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.A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power [NCERT Exemplar Problems]

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(a) + 0.5 D (b) – 0.5 D (c) + 0.2 D (d) – 0.2 D

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Class 10 science 3 years 1 Answer 12 views Enlightened 0

2.The air layer of atmosphere whose temperature is less then the hot layer behave as optically

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(a) denser medium (b) rarer medium (c) inactive medium (d) either denser or rarer medium

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Class 10 science 3 years 1 Answer 26 views Enlightened 0

1.When white light enters a prism, it gets split into its constituent colours. This is due to

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(a) different refractive index for different wavelength of each color (b) each colors has same velocity in the prism. (c) prism material have high density. (d) Scattering of light

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Class 10 science 3 years 1 Answer 5 views Enlightened 0

Light from the Sun falling on a convex lens will converge at a point called

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(a) centre of curvature (b) focus (c) radius of curvature (d) optical centre

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Class 10 science 3 years 1 Answer 12 views Enlightened 0

The refractive index of water is 1.33. The speed of light in water will be

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(a) 1.33 × 108 m/s (b) 3 × 108 m/s (c) 2.26 × 108 m/s (d) 2.66 × 108 m/s

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Class 10 science 3 years 2 Answers 10 views Enlightened 0

The refractive index of transparent medium is greater than one because

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(a) Speed of light in vacuum < speed of light in tansparent medium (b) Speed of light in vacuum > speed of light in tansparent medium (c) Speed flight in vacuum = speed of light in tansparent medium (d) Frequency ...

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Class 10 science 3 years 1 Answer 27 views Enlightened 0

As light travels from a rarer to a denser medium it will have

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(a) increased velocity (b) decreased velocity (c) decreased wavelength (d) both (b) and (c)

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Class 10 science 3 years 1 Answer 23 views Enlightened 0

The nature of image formed by a convex mirror when the object distance from the mirror is less than the distance between pole and focal point (F) of the mirror would be

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(a) real, inverted and diminished in size (b) real, inverted and enlarged in size (c) virtual, upright and diminished in size (d) virtual, upright and enlarged in size

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Class 10 science 3 years 1 Answer 12 views Enlightened 0

.A concave mirror of radius 30 cm is placed in water. It’s focal length in air and water differ by

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(a) 15 (b) 20 (c) 30 (d) 0

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Class 10 science 3 years 1 Answer 72 views Enlightened 0

The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be

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(a) at the focus (b) at the centre of curvature (c) between focus and centre of curvature (d) beyond centre of curvature

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Class 10 science 3 years 1 Answer 31 views Enlightened 0

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