A convex lens focusses an object 20 {cm} from it on a screen placed 5 {cm} away from it. A glass plate (refractive index =\frac{7}{5} ) of thickness 1.4 {cm} is inserted between the lens and the screen. What is the distance of the object from the lens, so that its image is again focused on the screen?

Correct Answer is : None of above

TS EAMCET 18-July-2022 Shift 2 Solved Paper

Section: Physics

Question : 102 of 160

Marks: +1, -0

A convex lens focusses an object 20cm from it on a screen placed 5cm away from it. A glass plate (refractive index =‌

) of thickness 1.4cm is inserted between the lens and the screen. What is the distance of the object from the lens, so that its image is again focused on the screen?

22.5cm
30.7cm
25.0cm
28.4cm
None of above

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∵v=20‌cm	‌
u=−5‌cm