Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

a concave lens is in contact with convex lens.The magnitude of the ratio of their powers is 2/3.Their equivalent focal length is 30cm.What are their individual focal lengths(in cm). a)-75cm,+50cm b)-15cm,10cm c)+75cm,-50cm d)75cm,50cm

a concave lens is in contact with convex lens.The magnitude of the ratio of their powers is 2/3.Their equivalent focal length is 30cm.What are their individual focal lengths(in cm).

a)-75cm,+50cm
b)-15cm,10cm
c)+75cm,-50cm
d)75cm,50cm
 
Grade:

1 Answers

Eshan
askIITians Faculty 2095 Points
2 years ago
Dear student,

P=1/f
\dpi{80} P_1/P_2=-2/3
\implies f_1=-\dfrac{3}{2}f_2
AlsoP=P_1+P_2
\dfrac{1}{30}=\dfrac{1}{f_1}+\dfrac{1}{f_2}=-\dfrac{2}{3f_2}+\dfrac{1}{f_2}
Hence findf_1,f_2

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free