Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Optics
Kaleidoscope is based on the principle of:
1
refraction of light
2
dispersion of light
3
reflection of light
4
More than one of the above
5
None of the above