1. An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is ? +15 cm – 15 cm 30 cm – 30 cm Answer: – 15 cm Explanation: View Answer Discuss in Forum Report Question

 2. If an incident ray passes through the focus, the reflected ray will ? pass through the centre of curvature retrace its path be parallel to the principal axis pass through the pole Answer: be parallel to the principal axis Explanation: View Answer Discuss in Forum Report Question

 3. The Angle of reflection is equal to the angle of incidence ? Sometimes Never Under special conditions Always Answer: Always Explanation: In accordance with the first law of reflection, which states that the angle of reflection is equal to the angle of incidence. View Answer Discuss in Forum Report Question

 4. Magnification produced by a rear-view mirror fitted in vehicles ? is equal to one is more than one is less than one can be more than or less than one depending upon the position of the object in front of it Answer: Is less than one Explanation: The convex mirror forms virtual, erect and diminished image of the object. And rear view mirror also forms some type of image. Therefore, magnification (m) produced by a rear view mirror fitted in vehicles is less than one i.e. m < 1. View Answer Discuss in Forum Report Question

 5. When object moves closer to a concave lens the image by it shift ? first towards and then away from the lens away from the lens on the other side of lens away from the lens on the same side of object toward the lens Answer: toward the lens Explanation: When object infinity, image is formed at the focus of concave lens of object is moved towards lens, the image is also moved from its focus towards lens and its size increase. View Answer Discuss in Forum Report Question

 6. The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of object should be ? between focus and centre of curvature beyond centre of curvature at the focus at the centre of curvature Answer: between focus and centre of curvature Explanation: When object lies at C of a concave mirror, image is also formed at ‘C’ and having same size real and inverted. View Answer Discuss in Forum Report Question

 7. For a real object, which of the following can produce a real image ? Convex mirror Concave lens Concave mirror Plane mirror Answer: Concave mirror Explanation: Only concave mirror can produces a real image for the any position of object between its focus and infinity. View Answer Discuss in Forum Report Question

 8. The angle of incidence for a ray of light having 45° reflection angle is ? 90° 45° 0° 30° Answer: 45° Explanation: For reflecting surface ?i = ?r View Answer Discuss in Forum Report Question

 9. In which of the following, the image of an object placed at infinity will be highly diminished and point sized ? Convex lens only Convex mirror only Concave mirror, convex mirror, concave lens and convex lens Concave mirror only Answer: Concave mirror, convex mirror, concave lens and convex lens Explanation: View Answer Discuss in Forum Report Question

 10. The refractive index of a medium with respect to vacuum is ? Equal to one Always greater than one Always less than one none of the above Answer: Always less than one Explanation: View Answer Discuss in Forum Report Question