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Image Formation by Lenses

State differe...

Question

State difference between a convex and a concave lens in their (a) appearance, and (b) action on the incident light.

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Solution

Convex lens:
(a) These typesof lenses are thickerin themiddle in comparison totheiredges.
(b) They converge the rays parallel to the principal axis.

Concave lens:
(a) These typesof lenses are thickerin theedges in comparison totheir middle.
(b) They diverge the rays parallel to the principal axis.

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State two differences between a convex and a concave lens.

Q. How does the action of a convex lens differ from that of a concave lens on a parallel beam of light incident on them? Draw diagram to illustrate your answer.

Q. What effect does a convex lens have on parallel rays of light incident on it? In what way is the effect of a concave lens different?

Q. Question 7
State two differences between a convex and a concave lens.

Q. State whether the following statements are 'true' or 'false' by writing T/F against them.
(a) A convex lens has a divergent action and a concave lens has a convergent action.
(b) A concave lens, if kept at a proper distance from an object, can form its real image.
(c) A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.
(d) A ray of light incident at the optical centre of lens, passes undeviated after refraction.
(e) A concave lens forms a magnified or diminished image depending on the distance of object.

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