0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

# A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of he combination, is :+6.67D−6.5D−1.5D+6.5D

A
1.5D
B
+6.5D
C
6.5D
D
+6.67D
Solution
Verified by Toppr

#### Given,f1=+40cmf2=−25cmPower, P=1fThe power of combination,P=1f1+1f2P=100+40cm+100−25cmP=−1.5DThe correct option is C.

43
Similar Questions
Q1
A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of he combination, is :
View Solution
Q2
A convex lens of focal length 40 cm is an contact with a concave lens of focal length 25 cm. The power of combination is
View Solution
Q3
An eye specialist prescribes spectacles having combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is
View Solution
Q4
Assertion :If a convex lens of focal length 40 cm is put in contact with a concave lens of 25 cm, then the power of the combination is - 1.5D. Reason: P=P1+P2=1f1+1f2
View Solution
Q5
An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopter is
View Solution