What can be the experiments

Snell's Law and Refraction: Using the ray box to produce a beam of light, you can shine it through the rectangular glass block at various angles of incidence. By marking the path of the light ray on paper and measuring the angles of incidence and refraction, you can verify Snell's Law (n₁sinθ₁ = n₂sinθ₂) and determine the refractive index of the glass.

Reflection: The plane mirror can be used to study the laws of reflection. By directing a light beam onto the mirror and observing the reflected ray, you can demonstrate that the angle of incidence equals the angle of reflection.

Total Internal Reflection: By using the semi-circular glass block and shining light from within the glass towards the flat surface at increasing angles, you can observe total internal reflection when the angle of incidence exceeds the critical angle.

Image Formation by Lenses: If you have convex and concave lenses (assuming they are part of the "lenses" mentioned), you can use the ray box to form parallel beams of light and study how these lenses converge or diverge light, forming real or virtual images.

Diffraction and Interference (if slits are available): If the ray box can produce narrow slits, or if separate slits are provided, you can investigate diffraction patterns when light passes through single or double slits, demonstrating the wave nature of light.