test post 1. A concave mirror forms the image of an object on a screen. If the lower half of the mirror is covered with an opaque card,the effect would be The image is less brighter The image is more bright The upper half of the image disappears The lower half of the image disappears 2. A virtual image of same size as object produced by Convex mirror Concave mirror Concave lens Plane mirror 3. Which mirror is used as a rear-view mirror in vehicles? convex mirror plane mirror as well as convex mirror concave mirror plane mirror 4. When light falls on a smooth polished surface, most of it is reflected in different direction is scattered is refracted into the second medium is reflected in the same direction 5. A convex lens of focal length 10cm forms a virtual image of an object at 30cm from the lens.The magnification pproduced will be 3.5 2 4.5 3 6. The image formed by a convex lens can be Virtual and magnified Virtual image is not formed Virtual and of same size Virtual and diminished 7. When the object is placed between f and 2f of a convex lens, the image formed is at f at 2f beyond 2f between O and f 8. The length of a vertical stick at the surface of a lake appears 12cm to a fish under water.If refractive index of water is 4/3, then actual length of stick above water surface is 16cm 9cm 3cm 12cm 9. If the image of an object formed by a concave mirror is inverted and smaller than the object,then u=2ƒ u>2ƒ u≥2ƒ u<2ƒ 10. The image of a distance object is obtained on a screen by using a concave mirror. The focal length of the mirror is measured by the distance between The object and the mirror The object and the screen The mirror and the screen The mirror and the screen and that between the object and the screen Loading … Question 1 of 10
