JEE PYQ: Ray Optics Question 50
Question 50 - 2019 (12 Jan Shift 1)
Formation of real image using a biconvex lens is shown below:
If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen?
(1) Image disappears
(2) Magnified image
(3) Erect real image
(4) No change
Show Answer
Answer: (1)
Solution
According to lens maker’s formula, $\frac{1}{f} = \left(\frac{\mu_{rel}}{ } - 1\right)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$ Focal length of lens will change due to change in refractive index $\mu_{\text{rel}}$. So, image will be formed at new position. Hence image disappears.
BETA
