Optics

This quiz on Optics has been carefully curated using previous year JEE Main questions, ensuring relevance and alignment with the actual exam pattern. It includes 2 quizes with 10 single correct multiple-choice questions, each with four options, covering key concepts such as reflection, refraction, lens and mirror formulas, prism optics, and optical instruments. Designed to test conceptual clarity and problem-solving skills, this set is ideal for practice and self-assessment. The questions reflect the difficulty level and style of JEE Main, helping aspirants strengthen their preparation. Answers are provided at the end for quick evaluation and learning. Perfect for revision and timed practice sessions.

Optics (Test 1)

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A convex lens of focal length 30 cm is placed in contact with a concave lens of focal length 20 cm. An object is placed at 20 cm to the left of this lens system. The distance of the image from the lens is:

2 / 10

A concave-convex lens has refractive index 1.5 and radii of curvature 30 cm and 20 cm. The concave surface is filled with liquid of refractive index 1.3. The focal length of the combination is:

3 / 10

A mirror produces an image with magnification 1/4. If the distance between object and image is 40 cm, the focal length of the mirror is:

4 / 10

Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially, 10 cm apart. The power of the combination is:

5 / 10

A lens of refractive index 1.6 has focal length 12 cm in air. Find its focal length in water (μ = 1.28):

6 / 10

A convex mirror of focal length 30 cm forms an image coinciding with that of a plane mirror placed behind it. The object is 30 cm in front of the convex mirror. The distance between the mirrors is:

7 / 10

An object is placed 40 cm from a spherical mirror and an image of magnification 1/2 is produced. To get magnification 1/3, the object should be moved:

8 / 10

The radii of curvature of a thin convex lens are 10 cm and 15 cm. The focal length is 12 cm. The refractive index of the lens material is:

9 / 10

Two identical objects are placed in front of a convex and concave mirror with same radius of curvature 12 cm, at 18 cm distance. The ratio of image sizes is:

10 / 10

A bi-convex lens has radius of curvature 1/6 cm. To replace it with a lens of unequal radii but same power, possible combination of R₁ and R₂ is:

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Optics (Test 2)

1 / 10

A spherical surface separates air and glass (μ = 1.5). Object is at O, center is C, radius is R. The image distance is:

2 / 10

A convex lens (μ = 1.5) has focal length 24 cm in air. When immersed in water (μ = 1.33), its focal length becomes:

3 / 10

Two concave refracting surfaces of equal radii and μ = 1.5 face each other. A point object is placed midway. The separation between images formed is:

4 / 10

A convex lens is silvered on one side. An object is placed such that image forms at same location. The object distance is:

5 / 10

A concave mirror produces an image such that object-image distance is 20 cm and magnification is –3. Radius of curvature is:

6 / 10

A prism of angle 4° and μ = 1.54 is combined with another prism of μ = 1.72 to get dispersion without deviation. Angle of second prism is:

7 / 10

A hemispherical vessel is filled with liquid of refractive index μ. A coin at bottom is visible from edge. Minimum μ is:

8 / 10

A plano-convex lens (μ = 1.5) immersed in liquid (μ = 1.2) behaves like concave mirror of focal length 0.2 m. Radius of curvature is:

9 / 10

A convex lens of focal length 40 cm forms image on photoelectric cell. Current I is produced. Replacing lens with same diameter but focal length 20 cm, current becomes:

10 / 10

A microscope focused on object at bottom of bucket. Liquid (μ = 5/3) poured, microscope raised by 30 cm to refocus. Height of liquid is:

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