OPTICS PRACTICALS: Focal Length of Convex Lens & Convex Mirror | DIY-TECH JOSHI

OPTICS PRACTICALS | DIY-TECH JOSHI

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In this detailed physics practical video, we demonstrate two important Optics experiments commonly prescribed in Class X / XI / XII Physics laboratories.
The video explains the experimental setup, procedure, observations, graph plotting, and calculations clearly and systematically.

✅ Covered in this video:

1️⃣ To find the focal length of a Convex Lens
Principle of image formation by a convex lens
Experimental setup using optical bench, lens, object, and screen
Measurement of object distance (u) and image distance (v)
Plotting graphs between u and v and 1/u and 1/v
Determination of focal length from the graph
Result, verification, and conclusion

2️⃣ To find the focal length of a Convex Mirror using a Convex Lens
Principle of mirror–lens combination method
Formation of real image using convex lens
Adjustment of convex mirror for coincidence of image and object
Measurement of radius of curvature
Calculation of focal length using
𝑓=𝑅/2
Final result and conclusion

🧰 Apparatus used:

Convex Lens, Convex Mirror, Optical Bench, Illuminated Object / Candle, Screen, Lens Holder, Mirror Stand, Meter Scale, Stand and Clamps

🔩 Key Concepts:
Image formation in lenses and mirrors
Lens formula and graphical method
Radius of curvature and focal length
Reflection and refraction of light

💡 Useful for Physics Lab Practicals, Board Exams, and Viva Preparation

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