Question

draw a ray diagram to show image formation in convex lens of focal length 10cm.When object is placed at a distance of 20 cm?
please tell fast I have my exam today
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Answer 1

ok correct

Explanation:

this is the answer

Answer 2

Explanation:

1f=1u−1v , called the lens formula where ‘u’ is the object distance and ‘v’ is the image distance measured from the pole of the lens of focal length ‘f’.

u=-10cm

and f=+20cm

hence, using lens formula: 1f=1v−1u

Putting the given values, we get

120=1v−1−10=1v+110

1v=120−110=−120

∴ v=-20cm