Geometrical optics questions with solutions

Showing 1–10 of 108 questions

• MCQmediumGeometrical opticsspherical mirror

  When an object is placed 40 cm from a spherical mirror, an image with magnification +1/2 is formed. To obtain an image with magnification +1/3, the object should be moved:

  Options

  • Option A

    80 cm away from the mirror

  • Option B

    40 cm away from the mirror

  • Option C

    20 cm towards the mirror

  • Option D

    20 cm away from the mirror

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• MCQeasyGeometrical opticslaw of refraction and total internal reflection

  A monochromatic light of frequency 5×10¹⁴ Hz travelling through air is incident on a medium of refractive index 2. The wavelength of the refracted light is:

  Options

  • Option A

    300 nm

  • Option B

    500 nm

  • Option C

    400 nm

  • Option D

    600 nm

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• NumericmediumGeometrical opticsrefraction due to curved surface

  Light from a point source in air falls on a convex curved surface of radius 20 cm and refractive index 1.5. If the source is located at 100 cm from the convex surface, the image will be formed at____ cm from the object.

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• NumericmediumGeometrical opticsapperant depth and shift due to slab

  Two immiscible liquids of refractive indices 8/5 and 3/2 respectively are put in a beaker as shown in the figure. The height of each column is 6 cm. A coin is placed at the bottom of the beaker. For near normal vision, the apparent depth of the coin is α/4 cm. The value of α is______.

  

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• MCQeasyGeometrical opticsspherical mirror

  A convex mirror of radius of curvature 30 cm forms an image that is half the size of the object. The object distance is :

  Options

  • Option A

    -15 cm

  • Option B

    45 cm

  • Option C

    -45 cm

  • Option D

    15 cm

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• MCQmediumGeometrical opticslens and combination lens,silvered lens

  A convex lens of focal length +30 cm is in contact with a concave lens of focal length -20 cm. An object is placed 20 cm to the left of the combination. The magnitude of the image distance is:

  Options

  • Option A

    30 cm

  • Option B

    45 cm

  • Option C

    60/7 cm

  • Option D

    15 cm

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• MCQeasyGeometrical opticslaw of refraction and total internal reflection

  Assertion (A): The refractive index of glass is greater than that of air. Reason (R): Optical density is directly proportional to mass density, which causes a proportional refractive index. Choose the correct answer.

  Options

  • Option A

    A is false but R is true

  • Option B

    Both A and R are true and R explains A

  • Option C

    A is true but R is false

  • Option D

    Both A and R are true but R does not explain A

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• MCQmediumGeometrical opticslens and combination lens,silvered lens

  A concave-convex glass lens has refractive index 1.5 and surface radii 30 cm and 20 cm as shown in the original figure. Its concave surface is filled with a liquid of refractive index 1.3. the focal length of the liquid-glass combination is:

  Options

  • Option A

    500/11 cm

  • Option B

    800/11 cm

  • Option C

    700/11 cm

  • Option D

    600/11 cm

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• IntegermediumGeometrical opticsapperant depth and shift due to slab

  A plane mirror is fixed 50 cm above the bottom of a tank. Water depth is 8 cm and refractive index is 4/3. A small bulb is at the bottom. Find the distance of the final mirror image from the bottom in cm.

  

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• MCQeasyGeometrical opticsdespersion of light ,despersive power and combination of prism

  When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different point on the principle axis after refraction. This is called :

  Options

  • Option A

    Scattering

  • Option B

    Chromatic aberration

  • Option C

    Spherical aberration

  • Option D

    Polarisation

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