The magnifying power of a convex lens of focal length 10 cm, when the image
The magnifying power of a convex lens of focal length 10 cm, when the image is formed at the near point is
Options
(a) 6 (b) 5.5 (c) 4 (d) 3.5
Correct Answer: […]
Ray Optics
A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens
A thin convex lens of refractive index 1.5 has 20 cm focal length in air. If the lens is completely immersed in a liquid of refractive index 1.6, then its focal length will be
An object is seen through a simple microscope of focal length 12 cm.
An object is seen through a simple microscope of focal length 12 cm. What will be the angular magnification produced, if the image is formed at the near point of the eye which is 25 […]
A concave lens of focal length f forms an image which is 1/3 times the size
A concave lens of focal length f forms an image which is 1/3 times the size of the object. Then, the distance of object from the lens is
Options
(a) 2f (b) f (c) […]
The velocity of image when object and mirror both are moving towards each other
The velocity of image when object and mirror both are moving towards each other with velocities 4 ms⁻¹ and 5 ms⁻¹ respectively, is
Options
(a) (-14ms⁻¹) (b) 15ms⁻¹ (c) (-9ms⁻¹) (d) 14ms⁻¹
Correct Answer: […]
The sun light reaches us as white and not as its components because
The sun light reaches us as white and not as its components because
Options
(a) air medium is dispersive (b) air medium is non-dispersive (c) air medium scatter the sunlight (d) air medium […]
Aperture of human eye is 0.2 cm. The minimum magnifying power of a visual
Aperture of human eye is 0.2 cm. The minimum magnifying power of a visual telescope, whose objective has diameter 100 cm is
Options
(a) 500 (b) 0.002 (c) 0.02 (d) 100
Correct Answer: […]
If critical angle for a material to air passage is 30°, the refractive index
If critical angle for a material to air passage is 30°, the refractive index of the material will be
Options
(a) 1 (b) 1.5 (c) 2 (d) 2.5
Correct Answer:
2
Explanation:
No […]
If the angle of minimum deviation is 60° for an equilateral prism, then the refractive
If the angle of minimum deviation is 60° for an equilateral prism, then the refractive index of the material of the prism is
Options
(a) 1.41 (b) 1.5 (c) 1.6 (d) 1.73
Correct […]
A microscope is having objective of focal length 1 cm and eye-piece of focal length 6 cm.
A microscope is having objective of focal length 1 cm and eye-piece of focal length 6 cm. If tube length is 30 cm and image is formed at the least distance of distinct vision, what […]