Lens and mirror formula in ray optics || Class 10 CBSE and icse board

For cbse board exam class 10 lens and mirror formula is an important but confusing topic for many students. Students feels overwhelming in application of sign convention and numericals from these formula seems difficult to solve. Here is ninja technique to solve numericals from lens and mirror formula class 10. just read this story- Grandmother said Rahul beta u are always negative. you become thin and your belly is curving inward so your focus is always negative. If you eat properly you will become healthy your belly curves outward then your focus will be positive. Rahul to Grandma - What about Veenita I love her. Grandma to Rahul- Beta if in the same side Veenita will be negative if she choose to stay in opposite side then she will be positive. Story ends here now you have learned Sign convention...... If not read again considering Curving inward - Concave lens/ mirror Curving outward - Convex lens/ mirror Focus - focal length Veenita - v( image distance) Time stamp 0:00 Introduction 1:04 Ninja technique to learn sign convention 8:12 How nature of image is determined by magnification 9:49 lens and mirror formula 13:07 for convex mirror how to find v, when R and u is given 23:45 for concave mirror how to find v when m and u is given 30:09 For concave lens how to find u when f and u is given 37:40 for convex lens how to find image geight when f, h and u is given #LensFormula #MirrorFormula #Optics #PhysicsClass10 #ScienceNumerica #SignConvention #cbseclass10boardexams #physicsG