1
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
A ray of light entering from air into a denser medium of refractive index $${4 \over 3}$$, as shown in figure. The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle $$\theta$$ should be equal to :
![JEE Main 2021 (Online) 25th July Evening Shift Physics - Geometrical Optics Question 95 English](https://imagex.cdn.examgoal.net/1kryzh5y2/0f6a7285-926f-4431-8caa-25e9b759c07c/0e7f2ba0-f5f5-11eb-92d9-470658ec3090/file-1kryzh5y3.jpg)
![JEE Main 2021 (Online) 25th July Evening Shift Physics - Geometrical Optics Question 95 English](https://imagex.cdn.examgoal.net/1kryzh5y2/0f6a7285-926f-4431-8caa-25e9b759c07c/0e7f2ba0-f5f5-11eb-92d9-470658ec3090/file-1kryzh5y3.jpg)
2
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
A ray of laser of a wavelength 630 nm is incident at an angle of 30$$^\circ$$ at the diamond-air interface. It is going from diamond to air. The refractive index of diamond is 2.42 and that of air is 1. Choose the correct option.
3
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
A ray of light passes from a denser medium to a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90$$^\circ$$ with each other. The angle of reflection and refraction are respectively r and r'. The critical angle is given by
![JEE Main 2021 (Online) 22th July Evening Shift Physics - Geometrical Optics Question 99 English](https://imagex.cdn.examgoal.net/1krtmemlb/0a02764b-2546-411d-a371-664dc4a3ad4c/060076f0-f302-11eb-a506-37d290d1d40d/file-1krtmemlc.jpg)
![JEE Main 2021 (Online) 22th July Evening Shift Physics - Geometrical Optics Question 99 English](https://imagex.cdn.examgoal.net/1krtmemlb/0a02764b-2546-411d-a371-664dc4a3ad4c/060076f0-f302-11eb-a506-37d290d1d40d/file-1krtmemlc.jpg)
4
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Region I and II are separated by a spherical surface of radius 25 cm. An object is kept in region I at a distance of 40 cm from the surface. The distance of the image from the surface is :
![JEE Main 2021 (Online) 20th July Morning Shift Physics - Geometrical Optics Question 101 English](https://imagex.cdn.examgoal.net/1krq8bdiu/536c89f5-29ba-4876-902a-9dbeeff3b701/91d00d60-f124-11eb-a221-f3b1f28d3393/file-1krq8bdiv.jpg)
![JEE Main 2021 (Online) 20th July Morning Shift Physics - Geometrical Optics Question 101 English](https://imagex.cdn.examgoal.net/1krq8bdiu/536c89f5-29ba-4876-902a-9dbeeff3b701/91d00d60-f124-11eb-a221-f3b1f28d3393/file-1krq8bdiv.jpg)
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