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qUESTIONS

MCQs-PYQs-12th-jee

Which of the following is not due to total internal reflection

MCQs-PYQs-12th-jee

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is

MCQs-PYQs-12th-jee

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should be microscope moved to get the mark in focus again

MCQs-PYQs-12th-jee

A light wave has a frequency of 4×10¹4 Hz and a wavelength of 5×10-7 meters in a medium. The refractive index of the medium is

MCQs-PYQs-12th-jee

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle 0, the spot of the light is found to move through a distance y on the scale. The angle 0 is given by [2017]

In a compound microscope, the focal length of the objective and the eye lens are 2.5 cm and 5 cm respectively. An object is placed at 3.75 cm before the objective and image is formed at the least distance of distinct vision, then the distance between two lenses will be (i.e. length of the microscopic tube)

A compound microscope has an eye piece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective so that final image is formed at the least distance vision (20 cm)

The length of the compound microscope is 14 cm. The magnifying power for relaxed eye is 25. If the focal length of eye lens is 5 cm, then the object distance for objective lens will be

The focal lengths of the objective and of the eye-piece of a compound microscope are fo and fe respectively. If L is the tube length and D, the least distance of distinct vision, then its angular magnification, when the image is formed at infinity, is

In order to increase the magnifying power of a compound microscope

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