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66. (i) How is the focal length of aspherical mirror affected when itis immersed in water?(ii) A convex lens has 10 cm focallength in air. What is its focallength in water? (Refractive indexof air-water 1.33, refractive indexof air-glass 1.5)Foreign 2010

Answer»

Thefocal lengthof aspherical mirroris notaffectedwhen it isimmersed in water- it remains same. Laws of reflection are independent of medium and hence reflection takes place in any medium without the change offocal length. But, in case of LENS, thefocal lengthchanges.

can you answer the second bit



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