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qUESTIONS

MCQs-PYQs-12th-jee

In an experiment to find the focal length of a concave mirror a graph is drawn between the magnitudes of u and v. The graph looks like

MCQs-PYQs-12th-jee

Two similar thin equi-convex lenses, of focal f each, are kept coaxially in contact with each other such that the focal length of the combination is F₁. When the space between the two lenses is filled with glycerin (which has the same refractive index (µ = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F₁: F₂ will be

MCQs-PYQs-12th-jee

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction

MCQs-PYQs-12th-jee

Which colour of the light has the longest wavelength

MCQs-PYQs-12th-jee

Pick the wrong answer in the context with rainbow

MCQs-PYQs-12th-jee

A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance

MCQs-PYQs-12th-jee

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is 1. The magnification of the telescope is

MCQs-PYQs-12th-jee

If the focal length of objective lens is increased then magnifying power of

MCQs-PYQs-12th-jee

The magnifying power of a telescope is 9. When it is adjusted for parallel rays the distance between the objective and eyepiece is 20 cm. The focal length of lenses are

MCQs-PYQs-12th-jee

A person can see clearly object only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

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