Question

two lenses of power 15 diopter and minus 10 diopter in contact with each other what is the focal length of this combination an object of size this agreement is placed at 30 cm from his combination of lenses position and size of image formed

Answer 1

hyy friend here is ur answer
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Power=1/focal length(meters) Combining two lens
Power is additive(if the lenses are thin) so
combined power is -10D -10=1/f hence
f=-0.1m=-10cm
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