Optics Quiz-1

Popular Questions InOptics Quiz-1

A ray of light propagating along the direction $\frac12(\hat i+\sqrt{3}\hat j)$ is incident on a plane mirror. After reflection, it moves along the direction $\frac12(\hat i-\sqrt{3}\hat j)$ . The angle of incident is

A spherical lens forms an image, twice the length of the object, on a screen. The distance between the object and the screen is 120 cm. The power of the lens, is (nearly)

The focal length, of a thin biconvex lens, is 20 cm. When an object is moved from a distance of 25 cm in front of it to 50 cm, the magnification of its image changes is $m_1$ to $m_2$ . The ratio $(\frac{m_1}{m_2})$ is

A convex lens is in contact with a concave lens. The magnitude, of the ratio of their focal lengths, is $\left(\frac23\right)$ . Their equivalent focal length is 30 cm. The individual focal lengths (in cm), of the two lenses, are, respectively,

An observer looks at a distant tree of height 10 cm, with a telescope of magnifying power 20. To the observer, the tree would appears.

In a Young’s double slit experiment, using monochromatic light of wavelength $\lambda$ , the path difference (in terms of integer n), corresponding to a point, having half the peak intensity, is

A beam consists of an unpolarised and a plane-polarised part. The beam is viewed through a polarised. On rotating the polaroid through one full circle, about the direction of propagation of the beam as axis, the intensity of the transmitted light.

The headlights of a car are 1.2 m apart. They emit light of $\lambda = 600$ nm. The diameter of the pupil of the observer's eye is 3 mm. The maximum distance of car from observer so that the two headlights are just resolved is

A beam of unpolarised light, of intensity $I_0$ , is passed through a polaroid A. It is next passed through another polaroid, B, which is oriented so that its principal plane makes an angle of $45^\circ$ , relative to that of A. The intensity of emergent light is