Conceptual Questions | Physics 10th | Chapter 12 Geometrical Optics | KPK Textbook Board, Peshawar скачать в хорошем качестве

Conceptual Questions | Physics 10th | Chapter 12 Geometrical Optics | KPK Textbook Board, Peshawar

Which type of lens would you use to start fire from light from sun concave or convex, would works best? At what distance from the lens should the paper be held for best results? If a concave mirror produces a real image, is the image necessarily inverted? Explain. Are rearview mirrors used in cars concave or convex? A magician during a show makes a glass lens with n=1.47 disappear in a trough of liquid. What is the refractive index of the liquid? Could the liquid be water? Suppose that you were handed a lens and a ruler and told to determine the focal length of the lens. How would you proceed? Can we achieve total internal reflection from optically rare medium to optically dense medium? Will a nearsighted person who wears corrective lenses in her glasses be able to see clearly underwater when wearing those glasses? When you use a simple magnifying glass, does it matter whether you hold the object to be examined closer to the lens than its focal length or farther away? Explain. In blind turns on hilly road, mirrors are used to help drives. Are these mirrors, concave mirrors or convex mirrors? Explain. 1. Choose the correct option. If the angle of incidence is 30° the angle of reflection will be (a) 30° (b) 45° (c) 90° (d) 210° When r is the radius of curvature of concave mirror. Real diminished image will be formed when the object is at (a) d_o greater then r (b) d_o=r (c) r greater then d_o greater than f (d) d_o=f The focal length of convex mirror with radius of curvature 10cm is (a) +10cm (b) +5cm (c) -10cm (d) -5cm An object is placed 7cm from a concave mirror whose radius of curvature is 10cm, the image formed will be (a) real and upright (b) virtual and upright (c) real and inverted (d) virtual inverted Which one of the following materials will refract light more (a) water (b) glass (c) air (d) diamond A convex lens with focal length 8.00cm has the power of lens (a) 2.05D (b) 4.00D (c) 12.5D (d) 16.0D If the distance from your eye’s lens to the retina is shorter than for a normal eye, you will struggle to see objects that are (a) nearby (b) colorful (c) far away (d) moving fast Who benefits more from using a magnifying glass, a person whose near point is located at a distance away from the eyes of (a) 75cm (b) 50cm (c) 35cm (d) 25cm The human eye forms the image of an object at its (a) iris (b) retina (c) pupil (d) cornea A 1.50cm high object is placed 20.0cm from a concave mirror with radius of curvature 30.0cm. Determine (a) the position of the image, and (b) its size, also draw the ray diagrams. A candle of height 8.0cm is located at a distance of 300mm from a convex mirror, its virtual image is formed behind the mirror at a distance of 3.0cm from the pole (or vertex). Find the focal length of the mirror and height of the image formed. Calculate the speed of light in zircon with index of refraction n=1.923, a material used in jewelry to replicate diamond. A light ray strikes an air/water surface at an angle of 46° with respect to the normal. The refractive index for water is 1.33. Find the angle of refraction when the direction of the ray is (a) from air to water and (b) from water to air. An optical fiber is made from flint glass with index of refraction 1.66 and is surrounded by a cladding made of crown glass with index of refraction 1.52. What is the critical angle? Suppose the book page is held 7.50cm from a concave lens of focal length 10.0cm and concave lens of focal length -10cm. What magnification is produced in each case? Gulalai is viewing a flea using a magnifier with f=3.0cm. If her near point is at N=25cm then calculate the maximum magnification she can get. A telescope has a magnification of 40.0 and a length of 1230mm. What are the focal lengths of the objective and eyepiece?