# A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source.  To get the sharp image again, the screen is shifted by a distance d.  Then d is: a. 0.55 cm away from the lens b. 1.1 cm away from the lens c. 0.55 cm towards the lens d. 0

## Question ID - 50070 :- A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source.  To get the sharp image again, the screen is shifted by a distance d.  Then d is: a. 0.55 cm away from the lens b. 1.1 cm away from the lens c. 0.55 cm towards the lens d. 0

3537

- =  f = 5cm

Shift due to slab=t in the direction of incident ray

=1.5 =0.5

Again,

=

= 10.55 cm

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