Physics
Grade-10
Easy
Question
The ray diagram below shows the image formation by a concave lens. Which of the following is true about different measurements?
- f, u and v all are positive
- f, u and v all are negative.
- f is negative and u and v are positive.
- f is positive and u and v are negative.
Hint:
- Distances that are calculated in the orientation of the incident ray are positive and the distances calculated in the direction opposite to the incident rays are negative.
The correct answer is: f, u and v all are positive
- According to the spherical lens, the sign convention is as follows:
- Distances that are calculated in the orientation of the incident ray are positive and the distances calculated in the direction opposite to the incident rays are negative.
- focal length of a concave lens is negative, according to the sign convention. Because the object is always on the lens's left side so its also negative here image is also on left side so its negative .
- f, u and v all are negative.
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