This is a list of questions for the first lesson, Reflection of Light at Curved Surface. Read through; comment if you have any doubts. Happy Solving
Topic: Reflection of Light at Curved Surface
Short Q&A (2 or 1 marks)
- What is reflection?
- Can we see inverted images in any mirror?
- What are the 2 laws of reflection?
- Why is a concave mirror called as converging mirror?
- Define the following.
- Centre of curvature c. Pole e.Principal Axis
- Radius of curvature d. Focus f.Focal length
- A set of parallel rays fall on a convex mirror. Through a ray diagram represent the reflected rays.
- Complete the ray diagram. Where will the image form & What will be its nature?
- Why is a convex mirror used as a rear-view mirror?
- Which mirror is used in car headlights and why?
- Can you obtain an erect image using concave mirror? Show it with a ray diagram.
- What is a real image?
- What is a virtual image?
- What is Fermat’s principle?
- What is magnification?
- List a few uses of concave mirror
- Draw and mark the following for AO ray and A’P ray
- Normal b. Angle of incidence and reflection c.Reflected ray
- Magnification produced by a concave mirror is +1. What does this mean? Where is the object placed?
- List sign convention followed in drawing ray diagram.
- Complete the table.
|S.No||Incident Ray||Reflected Ray|
|1||Parallel to P-axis||Through Focus|
|2||Passing through Focus|
|3||Through the centre of curvature|
|5||At the pole with angle of incidence = 450|
20. Complete the table.
|S.No||Object Position||Image Position|
|1||At F||At infinity|
|3||Between C & F|
|4||Between C & F|
|5||Behind the mirror|
4 Marks Q&A
- Write an activity to find the focal length of a concave mirror.
- Write an activity to observe different types of images formed by a concave mirror.
- Derive a formula to find the focal length of a mirror if you the values of image distance and object distance
- Explain the use of a concave mirror in solar cooker.
- Distinguish between concave and convex mirror.
- Draw ray diagrams. Comment on the nature of image formed.
- Object placed in front of a convex mirror
- Object placed within the focus of a concave mirror
- Discuss the importance of spherical mirrors in daily life or If spherical mirrors were not known to human beings, guess the consequences.
- The focal length of a concave mirror is 15 cm. Answer the following
- What will be the characteristics of image if the object is placed at 20 cm
- What is the maximum object distance to get an image inside mirror
- Where does an object need to be placed to get an image at infinite distance
- Where does an object need to be placed to get m=1.
|R = 2f units: cm or m
f = R/2
|1/f = 1/v + 1/u units: cm or m
1/v = 1/f – 1/u For a concave mirror both f and u will be always negative
1/u = 1/f – 1/v For a convex mirror, u will be negative; f and v will always be positive
|m = hi/ho no unit
m = -v/u
- Find the distance of the image when an object is placed on the principal axis at a distance of 10 cm in front of a concave mirror of radius 8 cm.
- A convex mirror has a focal length of 1.5 m. if bus is located 5m from the mirror, find the position, nature and magnification of the image formed.
- An object of 4 cm is placed at 25 cm in front of a concave mirror of focal length 15 cm. Find the image distance and height of the image.
- A concave mirror has a focal length 18 cm. What is the radius of curvature
The above numerical are just sample problems. Given any numerical question, the procedure to solve will involve the same steps with the use of the above tabulated formula.