Question

12. a) The values of object distance (v) and image distance (v) are tabulated in the experiment to find the focal length of a concave mirror, as follows.






Answer the following questions.
i) What is the focal length of the concave mirror ?
ii) What is the radius of curvature of the mirror ?
iii) At what distance, the object be placed to get a virtual image ?
iv) If object is kept at 50 cm. from pole, what are the characteristics of the image formed ?​

Answer 1

Answer:

1.From the observation 3, we can say that Radius of curvature is 40cm so foal length of the convex lens is 20cm.[f=R/2]

2. Observation 6 is incorrect , as the object is in between P and F, the image formed will be virtual image on the same side of object, image distance should be negative.

3.Ray diagram for observation 3: Please refer attachment : object beyond C

4. magnification=m=v/um=30/-60=-1/2= -0.5so the image is real, inverted and diminished.