JEE Main 2021 (Online) 26th August Evening Shift | Ray & Wave Optics Question 86 | Physics

JEE Main 2021 (Online) 26th August Evening Shift

Numerical

-1

A source of light is placed in front of a screen. Intensity of light on the screen is I. Two Polaroids P₁ and P₂ are so placed in between the source of light and screen that the intensity of light on screen is I/2. P₂ should be rotated by an angle of (degrees) so that the intensity of light on the screen becomes $${{3I} \over 8}$$.

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JEE Main 2021 (Online) 26th August Evening Shift

Numerical

-1

An object is placed at a distance of 12 cm from a convex lens. A convex mirror of focal length 15 cm is placed on other side of lens at 8 cm as shown in the figure. Image of object coincides with the object.

JEE Main 2021 (Online) 26th August Evening Shift Physics - Ray & Wave Optics Question 87 English

When the convex mirror is removed, a real and inverted image is formed at a position. The distance of the image from the object will be .............. (cm)

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JEE Main 2021 (Online) 26th August Morning Shift

Numerical

-1

White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separation between the slits is 0.3 mm. The first violet and red fringes are formed 2.0 mm and 3.5 mm away from the central white fringes. the difference in wavelengths of red and violet light is ................ nm.

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JEE Main 2021 (Online) 27th July Evening Shift

Numerical

-1

The difference in the number of waves when yellow light propagates through air and vacuum columns of the same thickness is one. The thickness of the air column is ___________ mm. [Refractive index of air = 1.0003, wavelength of yellow light in vacuum = 6000 $$\mathop A\limits^o $$]

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