Question

hey can anyone solve this plz anyone ?
I will mark brainliest plz ans

and no scammers​

Answer 1

${\huge{\bf{\red{HELLO!!}}}}$

ACROSS

2. convex lenses

5. photoelectric sensors

6. transparent object

7. conera

9. vaccum

11. a plastic or glass block and a ray box

12. angle in incidence

13. normal lines

DOWN

1. km/sec

3. air, water etc are the things where light slows

4. electronagnetic wave

8. shadow

10. luminous objects

(if it helps please mark me as the brainliest and follow me)............