A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm 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 :
Text Solution
Verified by ExpertsThe correct answer is:
B
2f = 10 cm so f = 5 cm
Now due to glass plate shift iV~ = 
= 1.5 
= 0.5cm
So new u = 10 – 0.5 = 9.5 cm
So, shift 
cm away from the lens
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A car is fitted with a convex side–view mirror of focal length 20 cm. A second car 2.8 m behind the…
A beaker contains water up to a height h 1 and kerosene of height h 2 above water so that the total…
When monochromatic red light is used instead of blue light in a convex lens, its focal length will :
An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass pla…
Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in…
The graph between angle of deviation ( δ ) and angle of incidence (i) for a triangular prism is rep…