1.

(a)For the same angle of incidence of 45°, the refraction angle in twotransparent media P and Q is 20° and 30° respectively. Which ofthe two is optically denser and why?(b)Define 1 dioptre power of a lens.(c)Find the focal length of a lens of power + 0.5 D.​

Answer»

Answer:

1 dioptre is the POWER of a lens WHOSE FOCAL length is 1 m........

focal length =1/p is the distance is in m or 100/f if it is in cm .......



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