Physics GK · all questions

Light
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Q241

Which type of lens is required for correcting the vision of a person with myopia?

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Q242

If an object is placed 10 cm away from a convex mirror of radius of curvature of 5cm what will be its magnification?

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Q243

Consider the following phenomena.
1. Size of the Sun at dusk
2. Colour of the Sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky
Which of the above are optical illusions?

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Q244

To get a diminished, virtual and erect image of a tall building, which mirror is used?

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Q245

Where should an object be placed in front of a convex lens in order to obtain its original size?

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Q246

A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?

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Q247

Light travel in a

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Q248

Mirage formation is an example of

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Q249

An electron microscope gives higher magnification than an optical microscope because

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Q250

Which type of image is always formed by a convex mirror?
1. Real
2. Virtual
3. Enlarged

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Q251

The outside rear view mirror of modern automobiles is marked with warning 'objects in mirror are closer than they appear'. Such mirrors are

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Q252

Light waves are . . . . . . . .

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Q253

The generating images on a screen by focusing an electronic beam on phosphorus coated screen is called

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Q254

The minimum height of a plane mirror to see the full size image of a person is equal to

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Q255

Which of the following colors of white light has the highest wavelength?

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Q256

Shaving mirror is

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Q257

A rear-view mirror for driving is

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Q258

We see the color of grass as green because-

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Q259

Which of the following waves can not be polarised?

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Q260

Velocity of light is maximum in

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