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 and  are the focal lengths of a convex lens for violet and red light respectively and  and  are the focal lengths of a concave lens for violet and red light respectively, then

a)

 and

b)

 and <

c)

 and

d)

 and



Question ID - 152299 | SaraNextGen Top Answer

 and  are the focal lengths of a convex lens for violet and red light respectively and  and  are the focal lengths of a concave lens for violet and red light respectively, then

a)

 and

b)

 and <

c)

 and

d)

 and

1 Answer
127 votes
Answer Key / Explanation : (b) -

(b)

According to lens makers formula

Since  and

Note: Always keep in mind that whenever you are asked to compared (greater than or less than)  or  you must not apply sign conventions for comparison

127 votes


127