Chapter 28 – Electromagnetic Waves

A simple microscope has a focal length of 5cm. Final image is formed at the least distance of distinct vision is , then its magnification will be A simple microscope has a focal length of 5cm. Final image is formed at the least distance of distinct vision is then its magnification will be October 27, [...]

The least distance of vision of a longsighted person is 60 cm. By using a spectacle lens, this distance is reduced to 12 cm. The power of the lens is The least distance of vision of a longsighted person is 60 cm. By using a spectacle lens this distance is reduced to 12 cm. The [...]

A 2.0 cm tall object is placed 15 cm in front of concave mirror of focal length 10 cm. What is the size and nature of the image? A 2.0 cm tall object is placed 15 cm in front of concave mirror of focal length 10 cm. What is the size and nature of the [...]

For a situation shown in figure, find the refrective index of glass so that it will suffer total internal reflection at the vertical surface. find the refrective index of glass so that it will suffer total internal reflection at the vertical surface. For a situation shown in figure October 27, 2020 Category: AIIMS Last 24 [...]

Focal length of objective and eye piece of telescope are 200cm and 4cm respectively. What is the length of telescope for normal adjustment? Focal length of objective and eye piece of telescope are 200cm and 4cm respectively. What is the length of telescope for normal adjustment? October 27, 2020 Category: AIIMS Last 24 Years Solved [...]

A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is Light wave enters from medium 1 to medium 2. Its velocity [...]

Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of [...]

A person uses +1.5 D glasses to have normal vision from 25 cm onwards. He uses a 20 D lens as a simple microscope to see an object. Calculate the maximum magnifying power, if he uses the microscope without the glasses. A person uses +1.5 D glasses to have normal vision from 25 cm onwards. [...]

The near point of distinct vision is at 1 m for an elderly person. What power of lens is to be used to bring the near point to the minimum distance of distinct vision (25 cm)? The near point of distinct vision is at 1 m for an elderly person. What power of lens is [...]

The length of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is 1.5. Then the angle of prism is The length of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is 1.5. Then the angle of prism is October [...]