RPSC SSO 2019 Paper Photography

RPSC Senior Scientific Officer Photography Paper 2019
Total Questions – 100 Duration – Two hours

Light from apoint source in air falls on a spherical convex surface (n=1.5, radius of curvature = 20 cm). The distance of the light source from the glass surface is 100 cm. The location of image is
(a) + 100 cm
(b) + 50 cm
(c) + 25 cm
(d) – 50 cm

Find the distances of an object from a convex lens if image is two times magnified. Focal length of the lens is 10 cm.
(a) 5 cm and 15 cm
(b) 5 cm and 10 cm
(c) 10 cm and 15 cm
(d) 10 cm and 25 cm

The inverted image of a pin is formed on a screen located 9.0 m from a spherical mirror. The image is 4 times larger than the pin. Determine the object distance and the type of mirror used.
(a) 4.5 m, concave
(b) 2.25 m, concave
(c) 3.60 m, convex
(d) 4.5 m, convex

A coverging lens of focal length 5.0 cm is placed in contact with a diverging lens of focal length 10 cm. The combined ystem act as a
(a) converging lens of focal length 10 cm
(b) converging lens of focal length 20 cm
(c) diverging lens of focal length 5 cm
(d) diverging lens of focal length 20 cm

A transparent substance is behaving as convex lens in air and as concave lens in water, then its refractive index is
(a) less than air
(b) equal to water
(c) greater than air but less than water
(d) greater than water

Magnifying power of a simple microscope, when final image is formed at least distance of distinct vision is
(Symbols have their usual meanings)
(a) D/f
(b) 1+ (D/f)
(c) (f/D) + 1
(d) 1 + Df

In a reflecting telescope
(a) a convex lens with large aperature is used as objective
(b) a conves lens with small aperture is used as ojbective
(c) a concave lens with large aperture is used as objective
(d) a concave mirror is used as objective

Monochromatic source is used in Young’s double slit experiment. The shape of the interference fringes pattern formed on a screen is
(a) Curved line
(b) Circle
(c) Hyperbola
(d) Ellipse

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
(a) 18 cm, 2 cm
(b) 15 cm, 5 cm
(c) 11 cm, 3 cm
(d) 10 cm, 10 cm

In an interference experiement third bright fringe is obtained at a point on the screen with a light of wavelength 700 nm. The wavelength of the light source that should be used in order to obtain 5th bright fringe at the same point is
(a) 420 nm
(b) 490 nm
(c) 600 nm
(d) 660 nm