Question

two thin by a biconvex lens of focal length 10 cm each are placed adjacent to each other then the power of the combination of the lense in diopter is​

Answer 1

Answer:

I don't no

Explanation:

because I don't no the question

Answer 2

Answer:

Class 12

>>Physics

>>Ray Optics and Optical Instruments

>>Combination of Lenses

>>Two thin lenses, when in co...

Question



Two thin lenses, when in contact, produce a combination of power +10 D. When they are 0.25 m apart, the power reduces to +6 D. The focal length of the lenses are:

A

20cm,30cm

B

30cm,40cm

C

12.5cm,50cm

D

25cm,50cm

Hard

Open in App

Solution



Verified by Toppr

Correct option is

C

12.5cm,50cm

p=p1+p2

10=p1+p2

6=10−0.25p1p2

16=p1p2

(p1−p2)2=(p1+p2)2−4p1p2

=100−4×16=100−64=36

p1−p