paper reflection

CAREER POINT REFLECTION AND REFRACTION MM 46 1Marks What is focal length of a plane mirror ? Define refractive index in terms of velocity of light ? The refractive index of kerosene is 2.12 what does it mean ? Define aperture and principal focus ? Define one dioptre ? 2 Marks Draw a ray diagram to the use of concave mirror as a shaving mirror ? Surface of the goggles are curved but still they have zero power . Why ? Why is convex mirror used as a rear view mirror in a car ? Write the sign Cartesians in case of a concave lens ? State the laws of refraction ? Explain with the help of a diagram why convex lens is called converging lens ? Explain why does the stream of hot rising above the fire appear wavering ? An object 4cm high is placed at a distance of 10cm from a convex mirror of focal length 20 cm. Find the position size and nature of the image ? Write a rough method to determine the focal length of a concave mirror ? What is power of the lens ? 3 Marks Find the position of the object which when placed in front of a convex mirror of focal length 20 cm produces a virtual image which is half the size Write the sign Cartesians for a lens ? Draw a ray diagram to show the nature position and size of a image when the object is placed at 2F in front of a convex lens ? Draw a ray diagram to show the nature position and size of a image when the object is placed at focus in front of a concave mirror ? It is required to obtain a real inverted image of same size as that of the object by a thin convex lens of focal length 20 cm where should be the object be placed ? A plane mirror is placed 22.5cm in front of a concave mirror of focal length 10 cm .Find where an object can be placed between the two mirrors so that image in both the mirrors coincide . Show with the help of a ray diagram the ray of light enters glass from air and then back to air ? Show the lateral displacement also ?