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vandana kumari

· started a discussion

· 1 Months ago

wrong answer (Question:763076.0)

convex len negative nhi hota positive hota

Knowledge Expert

· commented

· 1 Months ago

read the question before commenting properly, it is about concave lens.
Keep learning,
Team TR

vandana kumari

· commented

· 1 Months ago

at least answer wrong mat kijiye sir
Shivanshu Shukla

· started a discussion

· 1 Months ago

Wrong answer (Question:763076.0)

Convex focus length (positive)+

HEMRAJ

· started a discussion

· 1 Months ago

wrong answer (Question:763076.0)

plz correct the answer

Question:

Focal length of concave lens is–

Options:
A)

Positive

B)

Negative

C)

Either positive or negative

D)

None of these

Solution:

Ans: (b) Focal length of concave lens is Negative.

Focal length is a well known word in optical physics. Focal length is distance over which the parallel rays either converge or diverge. For convex lens the focal length is positive. On the other hand, the focal length of concave lens is negative.

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