Free physics question bank
lens and combination lens,silvered lens questions with solutions
Practice Geometrical optics for JEE Main, JEE Advanced, NEET, and Classes 11–12. Attempt each question, then open it for the full solution.
Showing 1–10 of 41 questions
- Multi-correctmediumGeometrical optics
A double convex lens made of glass of refractive index 1.5 and radii of curvature of the curved surfaces 20 cm each is immersed in a liquid of refractive index n(L). The correct plot showing the variation of the power, in the units of diopter (D), as a function of n(L) is:
Select all that apply
JEE Advanced2026Paper 1
Open question & full solution → - IntegermediumGeometrical optics
A symmetric convex lens has refractive index 1.8 and each surface radius 20 cm. It is immersed in a liquid of refractive index 1.5. If P(air):P(liquid) = x:1, find x.
JEE Mains11 April 2023Shift 1Morning Shift
Open question & full solution → - NumericmediumGeometrical optics
The size of the images of an object, formed by a thin lens are equal when the object is placed at two different positions 8 cm and 24 cm from the lens. The focal length of the lens is ________ cm.
JEE Mains 202623 January Evening Shift
Open question & full solution → - NumericmediumGeometrical optics
An object is placed on the principal axis of convex lens of focal length 10 cm as shown. A plane mirror is placed on the other side of lens at a distance of 20 cm. The image produced by the plane mirror is 5 cm inside the mirror. The distance of the object from the lens is ____ cm.
JEE Mains25 January 2023Shift 2Evening Shift
Open question & full solution → - MCQeasyGeometrical optics
A concave mirror of focal length f is completely immersed in a fluid of re index μ. Its new focal length is:
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JEE Mains 2025 23 Jan Evening Shift
Open question & full solution → - MCQmediumGeometrical optics
Two thin convex lenses of focal lengths 30 cm and 10 cm are placed coaxially 10 cm apart. The power of the combination is:
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JEE Mains 2025 7 April Morning Shift
Open question & full solution → - MCQmediumGeometrical optics
A thin symmetric biconvex lens is made of glass of refractive index 1.5. The magnitudes of the radii of curvature of both surfaces are 20 cm. The left surface is silvered externally, so the light passes through the lens, reflects and passes through the lens again. At what distance from the lens should an object be placed so that the final image is formed at the position of the object?
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JEE Mains 2026 8 April Evening Shift
Open question & full solution → - IntegermediumGeometrical optics
A convex lens of refractive index 1.5 and focal length f = 18 cm is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is α × f. The value of α is ________.
(refractive index of water = 4/3)
JEE Mains 202628 January Morning Shift
Open question & full solution → - MCQmediumGeometrical optics
An equiconvex lens of focal length f is cut into four parts as shown in the original question figure. The focal length of each part is:
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JEE Mains 2025 22 Jan Evening Shift
Open question & full solution → - NumericmediumGeometrical optics
The distance between an object and its 3 times magnified virtual image produced by a convex lens is 20 cm. The focal length of the lens used is ______ cm.
JEE Mains 2024 01 Feb Morning Shift
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