किसी लेन्स मे बाहर की अोर उ� – McqOptions

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1.	किसी लेन्स मे बाहर की अोर उभ्ररे दो गोलिया पृष्ठ उसे कहते है-
A.	अवतल
B.	एक -उतल लेन्स
C.	दो- उतल लेन्स
D.	सभी गलत है
Answer» D. सभी गलत है

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