# Solution - Refraction of Light - Refraction by Spherical Lenses

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ConceptRefraction of Light - Refraction by Spherical Lenses

#### Question

The distance between principal focus and optical centre of the lens is _________.

1. diameter
2. focal length
3. principal axis
4. optical centre

#### Solution

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Define focal length of a divergent lens.

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Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the:

(a) lens slightly towards the screen

(b) lens slightly away from the screen

(c) lens slightly towards the sun

(d) lens and screen both towards the sun

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Solution for concept: Refraction of Light - Refraction by Spherical Lenses. For the course 9th - 10th SSC (English Medium)
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