Across
- 2. and erect , If the magnification produce by a lens has a negative value, the image will be_____.
- 4. , The defect of eye in which the the eye ball becomes too long is _________.
- 7. , Twinking of star is due to____.
- 8. , Height of object is always_________.
- 11. , Full form of 'F' in case of mirror.
- 13. length, Full form of 'F' in case of lens.
- 14. ,magnifying power of concave lens is always less than____.
- 15. , When light falls on a smooth polished surface most of it is_______in the same direction.
- 16. , focal length of a concave mirror is always______.
- 18. , Light shows the phenomenon of reflection , refraction and_________.
Down
- 1. , in optics an object which has higher refractive index is called_________.
- 3. , __________is the natural phenomenon which is caused by the dispersion of sunlight in the sky.
- 5. , Focal length of a convex mirror is always______.
- 6. , Focal length of plane mirror is at________.
- 8. , From infinity rays always comes_________.
- 9. , In telescope___________lens is used.
- 10. , The unit of power of lens is__________.
- 12. _____________mirror can produce a virtual , erect and magnified image of an object.
- 15. , When white light enters a glass prism from air, the angle of deviation is least for_________.
- 17. and erect, Image formed by plane mirror is ________.