JEE Main 2019 (Online) 9th April Evening Slot | Ray & Wave Optics Question 170 | Physics

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-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

JEE Main 2019 (Online) 9th April Evening Slot Physics - Ray & Wave Optics Question 172 English

$$\sqrt 3 $$

3 / 2

$$\sqrt 2 $$

4 / 3

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-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 :-

3.0 × 10^–7 rad

4.5 × 10^–7 rad

1.5 × 10^–7 rad

2.0 × 10^–7 rad

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-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 :-

3 : 1

2 : 1

5 : 3

4 : 3

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-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