An astronomical reflecting telescope uses a large parabolic mirror to gather dim light from distant stars. A plane mirror is used to reflect the image to the eyepiece.

**1. The length of a telescope is 2 m and the focal length of the objectives is 2.0 cm. What is the focal length of the eyepiece?**

a. 194 cm

b. 196 cm

c. 198 cm

d. 200 cm

**2. A telescope has an objective lens of focal length 200 cm and an eye piece with focal. length 2 cm. If this telescope is used to see a 50 metre tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens?**

a. 5 cm

b. 10 cm

c. 1 cm

d. 2 cm

**3. Image formed by plane mirror is**

a. Real and erect

b. Real and inverted

c. Virtual and erect

d. Virtual and inverted

**4. What is the focal length of plane mirror? **

a. Positive

b. Negative

c. Zero

d. Infinity

**5. What is the size of the image formed by plane mirror?**

a. Less than the size of object

b. Greater than size of object

c. Same size as object

d. None of these.