Question

the three rules to be followed to draw a ray diagram of i ages obtained by convex lwnse

Answer 1

Case I. When the incident

light ray is parallel to the

principal axis In this case,

the refracted ray will pass

through second focus F2 for

a convex lens, and appear to

diverge from the first focus

F1for concave lens.

Case II. When the incident light ray

emerges from the first focus F1 of a

convex lens, or appears to emerge

from the second focus F2 of a

concave lens. In this case, light after

refraction from both the lenses will

move parallel to the principal axis.

Case III. When the light ray passes

through the optical centre (O) of a lens In

this case, the light ray will pass through

both the lenses without suffering any

deviation.

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Answer 2

1. Ray's coming parallel to principal axis converge at focus
2. Ray's directed to optical centre will emerge out undeviated
3. Ray's passing through focus will emerge parallel to principal axis