TS EAMCET · Physics · Ray Optics
When an object of height 12 cm is placed at a distance from a convex lens, an image of height 18 cm is formed on a screen. Without changing the positions of the object and the screen, if the lens is moved towards the screen, another clear image is formed on the screen. The height of this image is
- A 4 cm
- B 6 cm
- C 8 cm
- D 10 cm
Answer & Solution
Correct Answer
(C) 8 cm
Step-by-step Solution
Detailed explanation
For convex lens \(\mathrm{h}_0=12 \mathrm{~cm}, \mathrm{~h}_1=18 \mathrm{~cm}\) By displacement method, \(\begin{aligned} & \mathrm{h}_0=\sqrt{\mathrm{h}_1 \mathrm{~h}_2} \Rightarrow 12=\sqrt{18 \mathrm{~h}_2} \\ & \therefore \mathrm{~h}_2=8 \mathrm{~cm} \end{aligned}\)
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