G-10A TAM - TEST 3

What does positive value for image distance indicate in mirror sign convention?

• concave mirror

• inverted image

• virtual image

• real image.

In the sign convention of mirror, how is the object distance represented?

• negative if infront of the mirror,positive if behind the mirror.

• positive if infront of the mirror,negative if behind the mirror.

• positive if behind the mirror, negative infront of the mirror.

• always positive regardless of position.

An illuminated object is placed at distance of 20cm from converging lens of focal length 15cm.The image obtained on screen is _________

• upright and magnified

• Inverted and magnified

• Inverted and dimnished

• upright and diminished

What is the speed of light in a material that has index of refraction of 1.88?

• 3x10 8 m/s

• 1.88 x10 8 m/s

• 1.6 x10 8 m/s

• 5064x10 8 m/s

The refractive index of any medium is always ___________

• less than 1

• greater than 1

• 1

• 0

The distance between pole and focal point of a spherical mirror is equal to the distance between _________________

• pole and center of curvature

• focus point and center of curvature

• pole and object

• object and image

The angle of incidence for a ray of light passing through center of curvature of concave mirror is ___

• 45°

• 90°

• 0°

• 180°

If light travels through piece of glass at 2.1x10 8 m/s .What is the refractive index of glass?

• 1.14

• 1.43

• 2.1

• 6.3

If an object is placed 21cm from converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from lens, the image formed is slightly larger than object. The approximate focal length of lens is ____________

• 5cm

• 10 cm

• 18cm

• 20cm.

In order to obtain a real image twice the size of object with convex lens of focal length 15cm.The object distance should be __________

• more than 5cm but less than 10cm

• more than 10cm but less than 15cm

• more than 15cm but less than 30cm

• more than 30cm but less than 60cm