1
JEE Main 2022 (Online) 25th July Evening Shift
Numerical
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A convex lens of focal length 20 cm is placed in front of a convex mirror with principal axis coinciding each other. The distance between the lens and mirror is 10 cm. A point object is placed on principal axis at a distance of 60 cm from the convex lens. The image formed by combination coincides the object itself. The focal length of the convex mirror is ____________ cm.

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2
JEE Main 2022 (Online) 30th June Morning Shift
Numerical
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-1
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The refractive index of an equilateral prism is $$\sqrt 2 $$. The angle of emergence under minimum deviation position of prism, in degree, is ___________.

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3
JEE Main 2022 (Online) 29th June Morning Shift
Numerical
+4
-1
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A parallel beam of light is allowed to fall on a transparent spherical globe of diameter 30 cm and refractive index 1.5. The distance from the centre of the globe at which the beam of light can converge is _____________ mm.

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4
JEE Main 2022 (Online) 26th June Evening Shift
Numerical
+4
-1
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A small bulb is placed at the bottom of a tank containing water to a depth of $$\sqrt7$$ m. The refractive index of water is $${4 \over 3}$$. The area of the surface of water through which light from the bulb can emerge out is x$$\pi$$ m2. The value of x is __________.

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