Question

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Answer 1

Answer:

A

f=+10

since f is +ve,

convex lens

P=1/f

=100/10

=10D

B

f= -10

since f is -ve,

concave lens

P =1/f

=100/-10

=-10D

since object is placed at 8cm from lens,

it is between P and F

and we know that in convex lens when object if placed between P and F the image formed is Virtual erect and enlarged.

Hope this helps ; )

Answer 2

Explanation:

Answer:

A

f=+10

since f is +ve,

convex lens

P=1/f

=100/10

=10D

B

f= -10

since f is -ve,

concave lens

P =1/f

=100/-10

=-10D

since object is placed at 8cm from lens,

it is between P and F

and we know that in convex lens when object if placed between P and F the image formed is Virtual erect and enlarged.

Hope this helps ; )

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