lf the focal length of the lens is . what is the distance of the image from the lens in the following figure?
1
5.5 cm
2
7.5 cm
3
12.0 cm
4
20.0 cm
Official Solution
Correct Option: (2)
According to figure, the point on the right side of the lens of which rays converge will behave as virtual object at the lens.
By lens formula
or or So, image will be formed on same side of the virtual object at a distance of 7.5 cm from the lens.
02
PYQ 2007
medium
physicsID: bhu-uet-
An equiconvex lens is cut into two halves along (i) and (ii) as shown in the figure. Let be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively. Choose the correct statement from the following
1
2
3
4
Official Solution
Correct Option: (3)
The focal length of equiconvex lens ...(i)
Case I When lens is cut along , then each half is again equiconvex with
Case II When lens is cut along , then each half becomes piano-convex with
Hence
03
PYQ 2008
medium
physicsID: bhu-uet-
A ray of light is incident on the surface of separation of a medium with the velocity oflight at an angle and is refracted in the medium at an angle . What will be the velocity of light in the medium?
