Ray Optics and Optical Instruments questions
782 published questions with worked solutions.
- If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the...
- The focal length of objective and eye lens of a microscope are 4 cm and 8 cm, respectively. If the least distance of distinct...
- When a plane mirror is placed horizontally on ground at a distance of 60 m from the base of a tower, then the top of the tower...
- A ray of light strikes a horizontal plane mirror at an angle of 45^ . A second plane mirror is attached at an angle with it. If...
- A ray of light makes an angle of 10^ with the horizontal above it and strikes a plane mirror which is inclined at an angle to the...
- Sun subtends an angle of 0.5^ at the centre of curvature of a concave mirror of radius of curvature 15 m. The diameter of the...
- How much water should be filled in a container of height 21 cm, so that it appears half filled to the observer when viewed from...
- Light travels in two media A and B with speeds 1.8 10^ 8 m ,s^ -1 and 2.4 10^ 8 m ,s^ -1 , respectively. Then, the critical angle...
- The radii of curvature of the two surfaces of a lens are 20 cm and 30 cm; and the refractive index of the material of the lens is...
- An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave...
- Two thin lenses have a combined power of +9 D. When they are separated by distance of 20 cm, then their equivalent power becomes...
- A convex lens of focal length 1.0 m and a concave lens of focal length 0.25 m are 0.75 m apart. A parallel beam of light is...
- A double convex lens made of glass (refractive index n=1.5) has both radii of curvature of magnitude 20 cm. Incident light rays...
- A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the...
- A convex lens A of focal length 20 cm and a concave lens B of focal length 56 cm are kept along the same axis with the distance d...
- One surface of a lens is convex and the other is concave. If the radii of curvature are r_1 and r_2 respectively, the lens will...
- A convex lens of focal length 13 m forms a real, inverted image twice in size of the object. The distance of the object from the...
- The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the...
- An achromatic convergent doublet of two lenses in contact has a power of +2 D. The convex lens has power +5 D. What is the ratio...
- A glass convex lens ( _g=1.5) has a focal length of 8 cm when placed in air. What would be the focal length of the lens when it...
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