Question

Need answer for all multiple choice

30. If f78 and 1/125 (s) gives the (s) under the same lighting condition? proper exposure, what f-stop number should be used with 1/500 a) fi4 c)f116 a) You choose a bigger f/# pth of field (DOF) without changing the exposure, you do which of the following? c) You 32. Which of the following is NOT TRUE for a Keplerian telescope? b) You increase the shutter speed. d) You choose a wide-angle camera lens. combine both a) and b). a) Both the objective & eye piece have positive powers; b) It is used for star gazing; c) Its final image is erected; d) Its tube length is longer than the focal length of its objective lens. 33. Which of the following is NOT TRUE for a microscope? ) Both the objective & eye piece have positive powers; b) Its objective lens has a very short focal length; c) Its objective lens forms a virtual image; 34. All are monochromatic aberrations of mirrors and lenses except d) Its final image is inverted. b) Astigmatism e) Distortion )Spherical aberration c) Coma f) Diffraction d) Field curvature 35. Assuming the CCD array used has uniform sensitivity throughout the visible spectrum, in which of the following cases would you be able to best distinguish between two closely spaced stars? a) use a large objective lens and blue lightb) use a large objective lens and red light c) use a small objective lens and blue light d) use a small objective lens and red light 36. Which of the following color phenomena is not due to reflection? ) colors of flags b) crimson fall leaves c) the white clouds d) the blue sky 7. The maximum resolution of an imaging system (ex. Telescope) is primarily limited by its a) magnifying power b) focal length c) objective lens diameter d) eye piece. 38. Based o your general understanding of optics, why do people make bigger and bigger diameter objective lenses/primary mirrors for telescopes? a) to increase the resolving power b) to increase the light gathering power c) to increase the magnifying power d) to increase the focal length e) both a) & b) f) both c) & d) 39. Which of the following lenses or mirrors can be used to produce a magnified image? a) concave mirror b) convex lens c) convex mirror d) concave lens e)a)& b) f all 40. Which of the following lenses or mirrors can be used to produce a minified image? concave mirror b) convex lens c) convex mirror d) concave lens ) concave mirror b) convex lens c) convex mirror d) concave lens e) a) & b) ) concave mirror b) convex lens c) convex mirror d) concave lens )concave mirror b) convex lens c) convex mirror d) concave lens a) e) a) & b) f) all 41. Which of the following lenses or mirrors can be used to produce a real image? 42. Which of the following lenses or mirrors can be used to produce a virtual image? e)a) &b) f a 43. Which of the following lenses or mirrors can be used to produce a virtual image of the same size? e) flat mi 44. The incandescent light bulb operates at a temperature of 2900 K, what is its eak wavelength? In which re d) not enough informa b) 1.00 um, NIR c) 2.9 um, IR a)100nm, UV A photon has all of the following except a) energy b) momentum c) rest mass d) wavelength e) frequency 6. All of the following are photon interactions except innl les pair production c) photoelectric effect

Answer 1

45: photon does not have restmass. Its restmass is zero.

44: weins displacement law : Max.Wavelength× temp = 0.00289mK

So, max wavelength = 0.00289/2900 = 1um

43: plane / flat mirror makes virtual images and images are of same size as object.

42: Convex lens and concave mirror i.e a,b are correct.