1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A thin convex lens L (refractive index = 1.5) is placed on a plane mirror M. When a pin is placed at A, such that OA = 18 cm, its real inverted image is formed at A itself, as shown in figure. When a liquid of refractive index μ1 is put between the lens and the mirror, The pin has to be moved to A', such that OA' = 27 cm, to get its inverted real image at A' itself. The value of μ1 will be :- JEE Main 2019 (Online) 9th April Evening Slot Physics - Ray & Wave Optics Question 172 English
A
$$\sqrt 3 $$
B
3 / 2
C
$$\sqrt 2 $$
D
4 / 3
2
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Diameter of the objective lens of a telescope is 250 cm. For light of wavelength 600nm. coming from a distant object, the limit of resolution of the telescope is close to :-
A
3.0 × 10–7 rad
B
4.5 × 10–7 rad
C
1.5 × 10–7 rad
D
2.0 × 10–7 rad
3
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distances x1 and x2 (x1 > x2) from the lens. The ratio of x1 and x2 is :-
A
3 : 1
B
2 : 1
C
5 : 3
D
4 : 3
4
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index μ is put in front of one of the slits, the central maximum gest shifted by a distance equal to n fringe widths. If the wavelength of light used is $$\lambda $$, t will be : JEE Main 2019 (Online) 9th April Morning Slot Physics - Ray & Wave Optics Question 174 English
A
$${{D\lambda } \over {a\left( {\mu - 1} \right)}}$$
B
$${{2nD\lambda } \over {a\left( {\mu - 1} \right)}}$$
C
$${{2D\lambda } \over {a\left( {\mu - 1} \right)}}$$
D
$${{n\lambda } \over {\left( {\mu - 1} \right)}}$$
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