Central Board Of Secondary Education [CBSE] — cbse class 10 science examination

The set 3 of the science paper had a question on presbyopia and we had to make a diagram of correcting bifocal lens
Unfortunately, that diagram of bifocal lens was not in the ncert book. Please help me in this situation. I worked really hard for the paper and focused purely on never. Also, i have a doubt that presbyopia not necessarily need a bifocal lens because it is mentioned that bifocals are only needed when a myopic person gets hypermetropia or presbyopia (Old age hypermetropia)
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The question paper of 2019 Kannada has given many questions which was not in the portion of 10 class. 18 marks should be given grace.
How irresponsible are you management in setting up today's Kannada paper..
That question paper had very less questions, which had be prescribed by the CBSE as is annual syllabus.. Who is responsible for the loss of students suffering !
I am student of class 12 today while giving exam, there was announcement done by the inviligator that in question no 11 and 12 u must try because there would be grace marks for it, but now there is. no news like that . due to instructions of inviligator i had not tried to attempt my question properly

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