Physics
Grade-10
Easy
Question
Focal length of one side of a biconvex lens is 56 cm. Its second focal length would measure ____ cm.
Hint:
When the rays passed from both sides are equal, the focal length will be same and equal on both sides.
The correct answer is: 56
When the focal length of one side of a biconvex lens is 56 cm, Its second focal length would measure 56 cm.
- The biconvex lens forms focal lengths on both sides that can be represented as the first and the second focal lengths.
- When the rays passed from both sides are equal, the focal length will be equal on both sides.
- If the focal length is 56 cm on one side, the second focal length of the opposite side will be 56 cm.
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