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.The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to

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(a) presbyopia (b) accommodation (c) near-sightedness (d) far-sightedness

Class 10 science 3 years 0 Answers 2 views Enlightened 0

A beam of light is incident through the holes on side A and emerges out of the hole on the other face of the box as shown in the figure. Which of the following could be inside the box? [NCERT Exemplar Problems

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a) Concave lens (b) Rectangular glass slab (c) Prism (d) Convex lens

Class 10 science 3 years 0 Answers 6 views Enlightened 0

Bi-focal lens are required to correct

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(a) astigmatism (b) coma (c) myopia (d) presbyopia

Class 10 science 3 years 0 Answers 5 views Enlightened 0

8. The focal length of the eye lens increases when eye muscles

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(a) are relaxed and lens becomes thinner (b) contract and lens becomes thicker (c) are relaxed and lens becomes thicker (d) contract and lens becomes thinner

Class 10 science 3 years 0 Answers 3 views Enlightened 0

The bluish colour of water in deep sea is due to

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(a) the presence of algae and other plants found in water (b) reflection of sky in water (c) scattering of light (d) absorption of light by the sea

Class 10 science 3 years 0 Answers 7 views Enlightened 0

The clear sky appears blue because

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(a) blue light gets absorbed in the atmosphere. (b) ultraviolet radiations are absorbed in the atmosphere. (c) violet and blue lights get scattered more than lights of all other colours by the atmosphere. (d) light of all other colours is ...

Class 10 science 3 years 0 Answers 8 views Enlightened 0

Who first demonstrated the existence of em waves?

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Class 12 Physics 3 years 0 Answers 12 views Enlightened 0

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