Question

5) Observe the diagram given below and answer the questions that follow
1. Name the lens
2. Name the distance OX
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Answer 1

Answer:

1. Concave lens

As the ray is going away from the normal (diverging).

2. Focal length

Answer 2

Answer:

1. Name the lens = concave lens

2. Name the distance OX =  focal length.

Explanation:

• In the figure the light ray is falling parallelly on the lens surface. After transmission through the lens it is diverged.
• Concave lens: The lens with two bulging in surfaces is called concave lens. If light rays fall parallelly on one surface then the light rays will emerge from another surface and the rays will diverge from the focus of the lens.
• In the diagram the light ray is diverging, so the lens is concave lens.

      The light ray is diverging from a point 'X', so X is the focus.

       O is the centre of lens. The distance between the centre and focus is called focal length.

       So, OX is focal length.

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