Question

A convex lens forms real and inverted image of a needle at a distance of 30 cm from it.
a) where is the needle placed in front of the convex lens if the image is equal to the size of the object?

b) find the power of the lens.


Plz help me in this question.... And plzzz answer crtly.... Humble request...

Answer 1

Explanation:

a) object is placed at center as image size=size of the object

so ,u = -30 cm

b)power if reciprocal of focal length,

r=30cm

f=0.15m

P=1/f

P = 1/0.15=6.66666...

P=+6.67D

Answer 2

Answer:

answer is 6.67 dioptre ...

Explanation:

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