1.

how are power and focal length of a lens related? you are provided with two lenses of focal length 20 CM and 40 CM respectively. which lens will you use to obtain more convergent light?

Answer»

p=1/fso 20cm will give more convergence as f is small p is larger

p=1/fso 20cm will give more convergence as f is small p is larger

P=1/f where f is focal length and P is powerP=1/0.2= 5D and 2.5D respectivelyso for more convergent light lens with f=20cm should be used

p=1/fso 20cm will give more convergence as f is small p is larger



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